184 



CoNNAL (A.) & CoNNAL (S. L. M.). The Development of Loa loa 

 (Guyot) in Chrysops silacea (Austen) and in Chrysops dimidiata. 

 (van der Wulp). — Trans. R. Soc. Trop. Med. & Hvg., London, 

 xvi, no. 1-2, 16th March & 18th May 1922, pp. 64-89, 5 plates, 

 1 map, 10 figs. 



This paper is an amphfication of observations made at Sapele 

 [R.A.E., B, X, 42], and also includes confirmatory results obtained, 

 at Calabar 



Development of Filaria (Loa) loa occurred equally in Chrysops 

 silacea and C. dimidiata. Under experimental conditions, flies remained 

 infective for five days, but it is possible that infectivity persists even 

 longer. The flies will bite natives more readily than Europeans, and 

 also show a preference for dark surfaces, as they apparently preferred 

 the black areas on the skin of guinea-pigs to the white ones. 



There is great disparity in size of the developing forms of F. loa, which 

 is accounted for by the delayed development of many of the embryos 

 in the stomach of the fly, where they have been found as long as 

 three days after ingestion. 



O'Kane (W. C). One Year o! the Crop Protection Institute. — //. 



Econ. Ent. Geneva, N.Y., xv, no. 3, June 1922, pp. 209-213. 



One of the projects of the crop protection institute was preliminary 

 work relating to the ox warbles, Hypoderma lineatimi and H. hovis.^ 

 The assistance of the Tanners' Council was sought and an appropriation 

 of ;£1,800, extending over a period of three years, was secured. This 

 appropriation is contingent on the securing of necessary funds from 

 other sources, in which connection several counties in New York State 

 have been approached. The proposed three-year programme involves 

 from 40,000 to 60,000 head of cattle. It is hoped to start the necessary 

 preliminary work in the winter of 1922. 



Dyar (H. G.). The Mosquitoes of the United States. — Proc. U.S. Nat. 

 Mus., Washington, D.C., Ixii, Art. 1, no. 2447, 1922, pp. 1-119. 



The United States as considered for the purpose of this paper 

 embraces the region between the Canadian and Mexican boundaries, 

 including southern Florida and Alaska and comprising three main 

 faunal regions. The most northern of these is the Canadian zone 

 (excluding Alaska), the mosquitos of which have been dealt with 

 'elsewhere [R.A.E., B, ix, 113]. The modified Canadian fauna occurring 

 in the mountains bordering the Pacific coast, the Cascades and Sierra 

 Nevada are included in the present paper. The second faunal region 

 comprises the coastal area on the Pacific between the mountains and 

 the sea, beginning in Washington State and extending up the coast 

 to Alaska. The third region extends from Mexico upwards through 

 the Mississippi Valley. In general the species are adapted to arid 

 conditions, in contrast to the species of the Canadian fauna in 

 connection with which melted snow forms a prominent factor. 



The nomenclature followed is that adopted by Howard, Dyar and 

 Knab, in The Mosquitoes of North and Central America and the West 

 Indies, 1912-1917. 



Keys are given to the tribes, genera and species occurring in the 

 United States; these inc\ade A edes [Heteronycha) iridipennis, sp. n., 

 described from a single female from Arizona. This species may be- 

 found to fall in Taeniorhynchus when the male is known. 



