327 



— Apices of sheaths of fore legs not extending to apices of Aving sheaths 



11 



11. Middle of wing sheath with a small distinctly raised area; apical ab- 

 dominal segment truncated, the upper pair of thorns directed 

 upward ProctdcanlJius milherti (p. 339). 



— Middle of wing sheath without raised area; apical abdominal seg- 



ment not truncated, the upper i)air of thorns directed backward 

 and slightly curved downward Asilus notatus (p. 340). 



I have not included any species in the key of which I have not ex- 

 amined specimens, preferring not to use descriptions which I might 

 misinterpret. I have, however, indicated in the text characters which 

 appear to be available for the separation of Systaxhiis orcus from Bx- 

 oprosopa fasciata and Apha^hantiis mus from Sparnopolius fiihnis. 



Brax lateralis Macquart has been recorded by Titus as predaceous 

 upon Ligyrus spp.* Unfortunately the figures and descriptions of the 

 larva and pupa given by him are too vague to permit my discovering 

 their distinctive generic characters. 



BOMBYLIID^ 



Many species of this family have been reared both in North Amer- 

 ica and in Europe, and the larvae have been found to be predaceous or 

 parasitic in all cases put upon record. Williston gives a summary of 

 their larval habitsf. Aphoehantus and Systocchiis are predaceous on 

 egg-masses of the locust Caloptenus spretus. Anthrax is recorded as 

 ])arasitic upon three genera of Hyiucnoptcra — MegacJiilc, Osuiia, and 

 Odyncriis — and three genera of Lcpidoptcra — Mamcstra, Noctua, and 

 Agrotis; Spogostyluui upon four genera of Hyuicnoptcra — Pclopociis, 

 Megachilc, Cenwnus, and Osmia — and two genera of Cole opt era — 

 Cicindcla and Calicodonia; Bomhyliiis upon the hymenopterous genera 

 Andrena and CoUctcs; Toxophora upon the hymenopteran Buiuenes; 

 and Systropus on the lepidopteran Limacodes; while Callostonia is 

 predaceous on the egg-masses of the locust Caloptenus italiccc. 



Vassiliew, in a short note on the biology of some European species 

 of Anthrax, records the occurrence of niorio Linn, and vchitina Fall, 

 as secondary parasites of Masycera sylz'atica Fall., a tachinid parasite 

 of Dendrolinus pini Linn. J 



*Some Miscellaneous Eesults of the Work of the Bureau of Entomology. Bull. 53, 

 Bur. Ent., U. S. Dept. Agr., 1905, p. 15. 



tManual of North American Diptera, p. 213. 1908. 



tBeitrag zur Biologie der Gattung Anthrax Scop. (Fam. Bombyliidae.), Zcitschr. 

 fiir Wiss. lusckteuhiol., Bd. 1, Heft 4, p. 174. 1905. 



