44 



The Oestrids of zebras are :—Rhinoestrus pur pur ens, Br., found in 

 the cervical cavities, and Gastrophilus pecorum, F., var. zebrae, n., 

 G. gedoelsti, sp. n., and other unidentified species of Gastrophilus all 

 taken from the stomach. 



A synoptic table of Gastrophilus larvae in the third stage is given, 

 with lists of species arranged according to those known in the larval 

 or adult stage only, as well as those known in both stages. 



Previous work on the pathological effect of the larvae and the method 

 adopted in America for their extermination is discussed. 



WiLHELMi (J.). Ueber Stomoxys calcitrans, "L. — Sitzungber. Ges. 

 Naturf. Freunde, Berlin, March 1917, no. 3, pp. 179-195, 3 figs. 



This paper deals with the results of various observations on Stomoxys 

 calcitrans, L., full details of which have been published elsewhere 

 [R.A.E., B, viii, 103]. 



WiLHELMi (J.). Zur Biologie der kleinen Stechfliege, Lyperosia irritans, 

 L. [Biology of L. irritans.] — Sitzungsbcr. Ges. Naturf. Freunde, 

 Berlin, October-December 1917, no. 8-10, pp. 510-516, 1 fig. 



Lyperosia irritans, L., unlike Stomoxys calcitrans, is never found in 

 large numbers in stables. It is most abundant in the open, and has 

 apparently no preference for light or shade. It is a blood-sucker, and 

 although found on horses and dogs, it apparently chiefly attacks cattle ; 

 on one animal as many as 1,000 individuals may be seen at once. 

 This fly is mo^t abundant during June, but has not been seen after 

 August. About 15 to 23 eggs are laid by each female. These hatch in 

 from 2 to 3 days, pupation occurring about 7 days later and lasting 

 at least 8 days. The shortest period noticed, during fairly warm 

 weather, from egg to adult was 17 days, but under cooler conditions 

 it may require 30 days or more. Although eggs were found in cattle 

 dung, and this was used for breeding purposes under laboratory 

 conditions, it is not apparently the chief site for larval development, 

 as no pupae were ever found in manure heaps in the field. The 

 natural enemies of this fly are probably the same as those attacking 

 Stomoxys calcitrans [R.A.E., B, viii, 103]. During the present 

 observations a mite, apparently distinct from Holotaspis sp. attacking 

 5. calcitrans, was found on the adults, and the larvae were attacked by 

 larvae of an Anthomyiid fly, Hydrotaea dentipcs. 



Hase (A). Beobachtungen iiber den Kopulationsvorgang bei der 

 Bettwanze [Cimex lectularius, L.). [Observations on the Pairing 

 of C. lectularius.'} — Sitzungsber. Ges. Naturf. Frennde, Berlin, 

 October 1918, no. 8, pp. 311-321, 6 figs. 



The contents of this paper are indicated by its title. 



ScHULZE (P.). Bestimmungstabelle fiir das Zeckengenus Hyalomma, 

 Koch. [Identification Table for the Tick Genus Hyalomma, 

 Koch.] — Sitzungsber. Ges. Naturf. Freunde, Berlin, May- June 

 1919, no. 5-6, pp. 189-196, 6 figs. 



A key is given to the species of the genus Hyalomma. The species 

 hippopotamense and monstrosum are not considered as belonging to 

 this genus, and the genera Cosmiomma and Nosomma respectively 

 have been erected for them. 



