Morphological description of an alate female of Zorotypus hamiltoni New (Zoraptera: Zorotypidae) from Colombia

An alate female of Zorotypus hamiltoni from Colombia is described and illustrated for the first time. The single specimen was collected in Santa María, Boyacá, Colombia and is currently deposited at the Museo Entomológico. Universidad Nacional, Agronomía, Bogotá, Colombia (UNAB).

Morphology and Chemical Contents of Dufour Glands of Pseudomyrmex Ants (Hymenoptera: Formicidae)

The morphology and ultrastructure of the Dufour gland of a pseudomyrmecine ant is described. The gland has an unusually large volume but possesses a very thin epithelial lining. Its morphology does not constitute a specific subfamily character as in some ant subfamilies. Analysis by gas chromatography-mass spectrometry of the glands of three species showed them all to be rich in saturated linear hydrocarbons (C17:0 and C15:0 dominant) and isopropyl esters of the common fatty acids. Each species produces its own characteristic mixture of these substances. The most abundant ester in Pseudomyrmex ferruginea is isopropyl oleate and in P. sp. A it is isopropyl palmitate, in P.flavicornis there is only a trace of isopropyl palmitate. An alate female of P. ferruginea contained a very similar mixture to that of the workers.

A new genus of myrmicine ants (Hymenoptera: Formicidae) from Venezuela

Based upon a single alate female the ant genus Bariamyrma from southern Venezuela is described as new. Recognized as a member of the lower Myrmicinae, its closest affinities with other myrmicines appear to be in the group of genera related to Lordomyrma.

A New Species of Aphid (Homoptera: Aphididae) from Sorbus

The species of aphid described here was collected from Sorbus scopulina Greene near Field, British Columbia. It belongs in the genus Nearctaphis Shaposhnikov, and the subgenus Nearctaphis, closely resembling the type species, Aphis bakeri Cowen, but with fused sclerotic plates on the dorsum of the abdomen in the apterous, as well as in the alate female.

African Aphididae.—Part II.

The following notes and descriptions of African plant-lice are based mainly on part of the large collection I have received from Mr. F. C. Willcocks, made in Egypt since 1907 ; specimens from Mr. Gerald Bedford, collected in the Transvaal and the Cape ;and a small collection of spirit specimens without any colour notes sent to the ImperialBureau of Entomology by Mr. T. J. Anderson from Nairobi, British East Africa.The collection made by Mr. Willcocks in recent years contains some hundreds of specimens, many in alcohol and many beautifully mounted, with field notes giving the living colours of most of the species. This very valuable collection seems to be almost complete for Egypt, for in a recent letter Mr. Willcocks tells me he is unable to find any new species. It contains a number of new insects and some well-known European and American species, including the corn pest, Aphis maidis, Fitch; the green pea louse, Macrosiphum pisi, Kalt.; Macrosiphum sonchi, L. ; the so-called yellow clover aphis of America, Callipterus trifolii, Monell, which is here shown to be the Aphis (Callipterus) ononidis of Kaltenbach; the water-plant aphid of Europe and America, Siphocoryne (Aphis) nymphaeae, L.; and the European willow aphid, Lachnus viminalis, Boyer. The bean-root aphid, Tychea phaseoli, Pass., was also sent and the alate female is now described, as well as the first alate female of Rhizobius, apparently referable to Buckton's Rhizobius graminis. A large number of specimens in Mr. Willcocks' collection yet remain to be examined, including species from Zizyphus, Duranta, artichokes and sycamore figs; also others from Nairobi and some tubes of specimens sent by Dr. Aders from Zanzibar to the Imperial Bureau.