Phalacrotophora. 421 



segment represents the sixth segment, or perhaps both the fifth and 

 sixth; if so I think that the specially thin-skinned area at the base 

 of it answers to the emargination in the front margin of the sixth 

 tergite mentioned under Aphiochaeta, and \ve get upon the whole 

 full conformity in the principal construction of abdomen in the two 

 genera. Legs as in Aphiochaeta, but the posterior tibiæ have always, 

 besides the posterodorsal row of bristles, also an anterodorsal row of 

 smaller bristles, not reaching quite to the apex ; in one species (fasciata) 

 the hind metatarsi are thickened. Wings as in Aphiochaeta; costa 

 from rather short to half the wing-length; the costal cilia generally 

 short. 



The developmental stages of the genus are known, but do not 

 seem to have been described. Westwood mentions (Introduct. II, 

 1840, 575) the larva of fasciata (atricapilla) hanging on a pupa of a 

 Coccinella; Rondani (Atti Soc. Ital. Se. nat. Milano, II, 1860, 165) 

 bred fasciata from pupæ of Coc. septempunctata ; the author thinks it 

 a parasite; Giraud (Schin. F. A. II, 1864, 343) found the larvæ of 

 the same species in pupæ of Coc. marginepunctata; de Meijere (Tijdschr. 

 V. Entom. 50, 1907, 189) bred the species {nigrocincta de Meij. = fa- 

 sciata Fall. see Villeneuve, Wien. Ent. Zeitg. XXXII, 1913, 128) 

 from a pupa of a Coccinella^ but does not think it is parasitical; 

 Martelli (Bull. Labor. Zool. Gen. e Ag. Portici, IX, 1914, 155) bred 

 the species from pupæ of Thea vigintidiiopiinctata and Adonia niargi- 

 nata\ he observed that the imago sucks the Coccinellid larvæ, but 

 does not otherwise think it is parasitical; Buysson (Bull. Soc. Ent. 

 de Fr. 1917, 249) bred it from the pupa of Coc. septempunctata^ he 

 considers the species as parasitical; the imagines emerged on ^7?; 

 Lichtenstein has (Compt. Rend. Hebdom. Acad. des Se. 170, 1920, 

 531) bred the species from Thea vigintiduopiinctata and Vibidia duo- 

 decimguttata; he saw the imagines sucking the Coccinellid larvæ and 

 pupæ, but without killing them; the eggs, one or more, were laid only 

 on the pupæ, between the legs; sometimes these pupæ were first 

 sucked; the larva hatches and goes into the pupa; it devours this 

 empty in two days and then bores itself out, and in the course of a 

 day it pupates on the leaf or in the ground; the imagines emerge in 

 two to three weeks. The author thus seems to have stated that the 

 species is a true parasite, for the sucking of the pupa before egg-depo- 

 sition did not kill the pupa, moreover such pupae were able to develop, 

 and further it was not always that the pupæ, on which eggs were 

 deposited, were sucked. Malloch (Proc. U. S. Nat. Mus. 43, 1912, 



