Dec, I9I3-] Townsend: Notes on Exoristid^. 303 



ably these are deposited inside the adult scarabseid host. Eutrixoides 

 quite certainly deposits maggots, probably inserting them inside the 

 host. Cryptoiiicigciiia and Emplianoptcryx belong to the subtribe 

 Meigeniina of the family Exoristidse. Eutrixoides quite certainly 

 belongs to the family Megaprosopidpe, and so does Eiifrixa in all prob- 

 ability. The last may need to be dissected to make sure of this. The 

 Megaprosopid?e deposit elongate maggots developed in utero from 

 elongate subcylindrical thin-chorion eggs, while the Meigeniina de- 

 posit thick-chorion flat-oval eggs incubated in utero. The two groups 

 are thus very distinctly removed from each other, though the general 

 habitus of the flies outside of the head characters may be similar. 



Mr. Walton's Chcctophlcps crassincrvis may quite possibly be a 

 female Lixophaga Towns. There are no characters in the descrip- 

 tion of the two forms to hinder this conclusion. Such differences as 

 are apparent may easily be sexual. Chcctophlcps female possesses 

 piercer, ventral carina and spinulje. 



Mr. W. R. Thompson has done some most excellent work on these 

 flies, and it is to be hoped that he will continue his publication of both 

 taxonomic and biologic results. His correction of the writer's sex- 

 determination of Acronarista is accepted herewith (Can. Ent., Vol. 

 XLIII, p. 313). 



Mr. John D. Tothill has begun a series of papers on these groups 

 in Can. Ent., Vol. XLIV, pp. 1-5. His descriptions are well drawn, 

 but his adoption of Coquillett's synonymy under Tachinophyto has 

 led him into error. Lixophaga is certainly a distinct genus from 

 Tachinophyto, and Methypostcna is also certainly distinct. If the 

 characters of discal abdominal macrochaetae, scutellar bristles, ciliate 

 facialia, cheek width, parafacial width, length of second antennal 

 joint, etc., are all found to be variable within the same sex, then 

 Pscitdoiiiyothyria may be the same as Tachinophyto. That such varia- 

 bility can occur is practically impossible. The following table will 

 show the distinctions : 



1. No discal abdominal macroch3et3e in either sex 2. 



Discal abdominal macrochsetse present in both sexes 3. 



2. No orbital bristles in male (parasitic on Rhynchophora) Lixophaga. 



Orbital bristles in both sexes, facialia not ciliate more than about one third 



way up, parafacials moderately wide, cheeks about one fourth eye- 

 height, scutellum with strong decussate apical pair of bristles reach- 

 ing base of third abdominal segment and two shorter lateral pairs, 



