18 



% Knab (F.). Egg-disposal in Demiatobia hominis. — Proc. Eniom. Soc, 

 Washington, D.C., xviii, no. 3, September 1916, pp. 179-183. 



Two female examples of the mosquito, Janthinosoma {Psowphora) 

 lutzi, bearing Demiatobia eggs, are described. These form a small 

 package attached ventrally to the base of the mosquito's abdomen, in 

 such a way that when the mosquito sucks blood, the free or hatching 

 end is nearest the skin of the victim. Adhering to the side of the vial 

 containing one of the specimens, which were preserved dry, was a newly 

 hatched Dermatobia larva. A third specimen of doubtful identity, 

 but undoubtedly a Psorophora bearing eggs, has also been obtained. 

 The eggs are attached to the mosquito and to each other by a varnish 

 insoluble in water and alcohol. Experiments made in breeding 

 Dermatobia eggs are described. Dr. Pedro Zepeda observed the 

 Dewmtobia larva leaving the mosquito while this was suckmg blood. 

 He also found the eggs of Dermatobia attached to the femora, antennae 

 and prothorax of the mosquito. 



In the discussion following the reading of this paper. Dr. Townsend 

 suggested that the female Dermatobia was probably led, through an 

 olfactory tropism, to oviposit upon the body of the carrier. The eggs 

 were incubated in the uterus and contained the fully formed maggot 

 at the time of deposition and the maggot was stimulated by the rise of 

 temperature to hatch at the time that the carrier imbibes a meal of 

 warm blood. The maggot being unable to penetrate thick skin of 

 itself, must enter the puncture made by the carrier and is perhaps 

 guided there to by the odour of the serous exudation following the 

 Avithdrawal of the carrier's proboscis. He stated that Cuterebra para- 

 sitises only thin-skinned hosts and has developed no carrier habit to 

 extend its parasitism to such thick-skinned hosts as man, cattle, dogs, 

 etc., as has evidently occurred in the case of Dermatobia, which was 

 probably likewise confined originally to thin-skinned hosts. This has 

 perhaps been due to a less acute sense of smell in Cuterebra, which 

 has the third antennal joint atrophied, while Dermatobia has this organ 

 very well developed. 



A bibliography of eight volumes is appended. 



Fayet (M.). Du diagnostic de la Gale sarcophitique 6quine sur le Front. 



[On diagnosing Sarcoptic Mange on Horses at the Front.] — Rev. 



Gen. Med. Vet., Toulouse, xxv, no. 299, 15th November 1916, 



pp. 539-548. 

 It is stated that in the field lice are a source of great trouble to 

 horses. Under war conditions, they may spread at an alarming rate. 

 The irritation they cause, which exhausts the animal, can sometimes 

 only be stopped by close clipping. This also enables the presence of 

 mange to be detected. 



McCuLLocH (Irene). An Outline of the Morphology and Life -History 



of Crithidia leptocoridis, sp. nov. — Univ. California Publicat. Zool, 

 Berkeley, xvi, no. 1, 16th September 1916, pp. 1-22, 1 %., 4 plates. 

 Large numbers of flagellates, Crithidia leptocoridis, sp. n., are 

 recorded in the intestinal tract of Leptocoris trivittatus (box-elder bug), 

 common about the buildings of the University of Kansas. The exact 

 conditions under which the insects become infected are not yet definitely 

 known. 



