1911] Study of Muscoid Flics 141 



preted the sexes. The sex which he calls the male and which 

 has the strong ventral keel is apparently the female, the keel 

 being functional as a protection to the point of the larvipositor. 

 The ventral groove described indicates this, and the fifth seg- 

 ment mentioned is probably the broad basal part of the larvi- 

 positor. If my surmise is correct, it appears that this form is 

 unique in having the male front wider than that of female. 

 At all events the genus must go in a group by itself, the Cela- 

 toriine, on the remarkable spinose character of the last-stage 

 maggot and puparium combined with the other striking char- 

 acters. 



Gymnosomatine series — Gymnosoma sp. (California and 

 Veracruz) dissected, TD 1815, 1815a. The uterus was not 

 noted and is probably absent. The egg is large, white, very 

 elongate-oval, flattened, chorion without reticulation. Gym- 

 nosoma and allies, perhaps including Oedemasoma, Parasites of 

 adult pentatomids. Habit, host-oviposition. 



Tachinine series — Neilsen is evidently wrong in his state- 

 ment that his Tachina larvarum deposited maggots. The 

 eggs which he referred to Carcelia were almost certainly those 

 of his T. larvarum. This can be seen by reading his text. 

 In his second paper (1910) he shows the egg of Carcelia to be 

 pediceled. 



Meigeniine series — This will need further division. The 

 present forms are parasites of Chrysomelid larvae, sawfly 

 larvae, and lepidopterous larvae. Tachinomyia appears to 

 belong here. The following further groups can be indicated 

 at present. 



Vivianiine series — For Viviania, Cryptomeigenia and allies. 

 All are parasites of adult beetles so far as yet known. 



Thrixionine series — Thrixion and allies. Parasites of 

 adult phasmids, etc. 



Plagiopine series. — Plagiops littoralis gen. et sp. nov. 

 (Ocean Beach, So. Florida), TD 738, mentioned above under 

 Meigeniine series, dissected. The uterus was not noted but is 

 perhaps present. The egg is small, flattened, and ovate. 

 Habit, host-oviposition. 



Plagiine ser — Siphoplagia sp. (Florida) dissected, TD 489; 

 Cyrtophloeba sp. (Mass.), TD 2731, and Plagia sp. (Mass.) 

 TD 2711, dissected. The uterus is in several coils and strap- 

 like in upper extent, the elongate subcylindrical eggs packed in 



