It can always be detected from G. nexa by the form of the hand and the manner in which the fingers impinge: in G. nexa the hand is broad towards the extremity, and the fingers meet only at the apex; in G. dispersa the hand gradually narrows to the apex, and the fingers meet each other through their whole length, the inner margin of the finger being finely serrated, the thumb not.
It also may be distinguished from G. Andrewsii by the breadth of the hands, which are narrow and round in G. Andrewsii, and moderately broad and flat in G. dispersa.
By an examination of the texture of the integument under a magnifying power of low degree, the surface of G. dispersa will be seen distinctly to differ from that of any of the others; it is covered with flat scales, fringed with short cilia. The length of the animal, including the arms, is about 2-1/4 inches.
Catalogue of Hymenopterous Insects collected at Celebes by Mr. A. R. WALLACE. By FREDERICK SMITH, Esq., Assistant in the Zoological Department, British Museum. Communicated by W. W. SAUNDERS, Esq., F.R.S., F.L.S.
[Read April 15th, 1858.]
This collection of the Hymenoptera of Celebes is specially interesting, as adding greatly to our knowledge of the geographical range of many well-known species, while the additions made to the Fossorial group contain many of great beauty and rarity. A new species belonging to the tribe of Solitary Wasps, Odynerus clavicornis, is perhaps the most interesting insect in the collection; this Wasp has clavate antenn?, the flagellum being broadly dilated towards the apex, convex above and concave beneath. I am not acquainted with any other insect belonging to the Vespidious group which exhibits such an anomaly.
Fam. ANDRENID?, Leach.
Gen. SPHECODES, Latr.
1. SPHECODES INSULARIS. S. niger, abdominis segmentis primo secundo et tertio (basi) rubris; alis hyalinis.
Male. Length 3-1/2 lines. Head and thorax black, closely and strongly punctured; the face below the antenn? with silvery-white pubescence; the joints of the flagellum submoniliform; the mandibles ferruginous. Thorax: the tegul? pale rufo-testaceous, wings hyaline, the nervures ferruginous; the metathorax coarsely rugose; the articulations of the legs and the tarsi ferruginous. Abdomen: the first, second, and base of the third segments red, the apical ones black, very finely and closely punctured, with the apical margins of the segments smooth and shining; a black spot in the middle of the basal segment.
Hab. Celebes.
Gen. NOMIA, Latr.
1. NOMIA PUNCTATA. N. nigra nitida punctata, alis nigro-fuscis.
Male. Length 4-1/2 lines. Shining black: head and thorax coarsely punctured, the metathorax ruggedly sculptured, truncate at the apex, the truncation and sides smooth with a few fine punctures; the abdomen closely and rather finely punctured, the apical margins of the segments smooth and shining. The tips of the mandibles, the tarsi and apex of the abdomen rufo-testaceous, the wings fuscous.
Hab. Celebes.
2. NOMIA FLAVIPES. N. nigra pedibus flavis, abdomine cinereo fasciato, alis hyalinis.
Female. Length 3-1/4 lines. Black; the face and cheeks densely clothed with short cinereous pubescence, the vertex thinly so; the margins of the prothorax, mesothorax and scutellum with a line of pale ochraceous pubescence, the disk of the thorax thinly covered with short pubescence of the same colour, the emargination of the metathorax as well as its sides with longer pubescence of the same colour; the base of the abdomen and basal margin of the second and following segments covered with short cinereous pubescence. The flagellum beneath fulvous; the mandibles ferruginous. The legs reddish-yellow, with the cox? and base of the femora black; the wings hyaline; the tegul? yellow, the nervures pale testaceous.
Hab. Celebes.
3. NOMIA FORMOSA. N. capite thoraceque nigris; abdomine chalybeo; marginibus apicalibus segmentorum c?ruleo fasciatis.
Female. Length 5-1/2 lines. Head and thorax black and very closely punctured; the face covered with griseous pubescence; the clypeus with a central longitudinal carina. Thorax: the apical margin of the prothorax, the margins of the scutellum, and the sides of the metathorax covered with a dense short ochraceous pubescence; the disk of the thorax thinly sprinkled with short black hairs; the posterior tibi? obscurely ferruginous; the tarsi ferruginous; the legs covered with bright golden-yellow pubescence; wings subhyaline, the nervures ferruginous; the tegul? yellow with a fuscous stain in the middle. Abdomen obscurely chalybeous, closely punctured, the two basal segments strongly so; the apical margins of the segments with smooth shining narrow blue fasci?.
Male. Closely resembling the female, but with the legs black; the posterior femora incrassate, the tibi? narrow at their base and broadly dilated at their apex, which, as well as the calcaria, are pale testaceous.
This species closely resembles a species from North China, N. chalybeata, Westw. MS., from which it is readily distinguished by the form of the fourth ventral segment, which is notched in the middle, rounded, and then emarginate with the lateral angles rounded; in the species from China the margin is arched, and
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