152 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



of the hosts, and those with few ovarioles whose mag- 

 gots are indicated with a query as probably deposited in 

 the vicinity of the host. Finally, the forms provided with 

 chitinous piercing organs at the tip of the female abdomen 

 are divided into those whose eggs are perceptibly tapered 

 at the posterior end and which are credited with a habit 

 of subcutaneous oviposition, and those whose eggs are the 

 same at both ends and which have the habit of subcutaneous 

 larvipositiou; the latter being divided again into those with 

 piercer and larvipositor distinct, and those with the two 

 combined. 



This grouping becomes in a large measure a true and natural 

 one, but a very considerable number of diverse types are left 

 together in groups i, v, and vi especially. In order to pre- 

 serve the relative proportions of the whole, these groups need 

 splitting, on whatever characters are available; external adult 

 characters to be used if the eggs, maggots, and reproductive 

 organs do not show sufficient differences, for many of these 

 types are pronounced in the adult. Separate mention of the 

 ten groups follows below, with general mention of the forms 

 referred to them. 



Group I. Species which glue a short flattened macrotype 

 egg to the body of the host. Pantel recognizes the fact that 

 the seventeen forms here grouped by him are of diverse types. 

 While his groups are manifestly not intended by him as tax- 

 onomic divisions, I feel confident that proper taxonomic 

 groups can be defined on the characters brought out by such 

 work supported by others judiciously selected from the ex- 

 ternal anatomy of the adult. Thus we have the following: 

 Phasiidae: Phasia crassipennis , P. ro strata, Cistogaster 

 globosa, (Xysta) grandis Egger, (.A".) semicana Egger, 

 and quite possibly Gymnosoma rotundatum and Stylogym- 

 nomyianitens. Tachinidae: Tachinn larvarum, (T. ) rnsiica, 

 Tricholyga major, Parasetigcna segrcgata, Ptychomyia se- 

 lecta, Winthemyia f-pnstnlata, Nemorilla rnaculosa, Meigenia 

 foralis, M. major, Thrixion halidayanum. These further 

 need subdivision into several tribes. 



The two Eggerian species that have heretofore been re- 

 ferred to Xysta are manifestly not that genus, and may be 

 referred to the new genus Euxysta, type X. semicana Egger, 

 erected in this paper. (See Group IX for Xysta.'} 



Tachina rnstica is the type of the genus Chcetotachina B. B. 

 Pantel's figure of the female reproductive system in this 

 species shows a very distinct type from that of Tricholyga and 

 Enphorocera (not Euph. clanpennis Coq.), which I take to 



