130 Annals Entomological Society of America [Vol. IV, 



developed from its anterior ventrolateral walls, one on each 

 side, these two sacs and the uterovagina together forming the 

 heart-shaped functional uterus, which contains the eggs until 

 the embryo has developed to the fully formed maggot ready for 

 deposition on host or food-substance. Sarcophaga and allies; 

 and possibly Rhinophora, Melanophora, Brachycoma and 

 allies, the last three genera being included by external anatomi- 

 cal analogy. Brachycoma is a Bombus inquiline or parasite; 

 Rhinophora and Melanophora are terrestrial-isopod parasites. 



11. Metopiine series — Metopia sp., TD 3988; Selenomyia 

 sp., TD 3998; Sarcomacronychia sp., TD 3996 (all Peru) 

 dissected and the first drawn. Uterus thick short V-shape, 

 the arms of the V being productions anteriorly of the ventral 

 walls of the uterovagina on each side, on the same plan as that 

 of Sarcophaga but in different form, not rounded but rectangu- 

 lar pouches, the form doubtless due largely to regular disposi- 

 tion of the contained eggs and maggots; spermathecal ducts 

 very long, doubled on themselves; tubular glands thick and mod- 

 erately long. Maggots and eggs regularly arranged on end in 

 uterus in triple and quadruple file. The uterovagina forms the 

 base of the V, thus functioning as part of the uterus; the empty 

 arms appear as blind tubes. Metopia, Selenomyia, Sarcoma- 

 cronychia and allies. It is to be noted that the facial plate in 

 the adult of Metopia is widely different from that of the rest 

 of the group, probably due to antennal development, thus indi- 

 cating its inferior rank in this series. Largely muddauber- 

 wasp inquilines or parasites, feeding on contents of nests. 

 Related to the Sarcophagine series. 



12. Compsilurine series — Compsilura concinnata (Eu- 

 rope), Dexodes nigripes (Europe), Vibrissina sp. (Florida), 

 and Eucelatoria spp. (Florida and Peru) dissected; TD 290, 

 132, 775, 1229, 3906. Uterus slender, long, in several coils, 

 maggots and eggs normally obliquely on end, the maggots 

 usually in single file, deposited subcutaneously in host through 

 the hollow curved piercer of female fly, the single file arrange- 

 ment doubtless for the purpose of facilitating the passage of 

 maggots through the piercer. This type is a modification of the 

 Hemimasiceratine type, with the addition of a piercing larvi- 

 positor for subcutaneous deposition of the maggots. Comp- 

 silura, Vibrissina, Eucelatoria and allies, including so far as 

 known all flies whose females are provided with a curved 

 piercing sharp-pointed larvipositor. 



