138 ENTOMOLOGICAL SOCIETY 



T. rilipesWied. This is Fabricius's Thereva pennipes (Syst. 

 Antl., 219, 8). The description is of the $ . I believe this 

 species to be the $ of hirtipes. I have a pair, taken in coitu 

 June 22, which, with several other specimens taken singly, 

 correspond with these two descriptions. The males have the 

 wings milky and tawny radiate, the tawny being more or less 

 in the form of a blotch. 



T. flavicornis Rob. Desv. Robineau Desvoidy described 

 the $ . 



T. formosa Wied. I have 3 $ and 2 9 of this species from 

 this vicinity. It is very near radiata, but is somewhat less 

 robust. (See T. radiata and T. lanipes.} 



T. hirtipes Fab. All the descriptions of this (Fab., Wied., 

 Rob. Desv.) are of the 9 , and I believe it to be the 9 of cilipes. 

 (See T. cilipes.} 



T. lanipes Fab. Wiedemann, Fabricius and Robineau Des 

 voidy describe its 9 Brauer and v. Bergenstamm (1. c.) indi 

 cate this to be the 9 ofcfot.mosa F. I know of no formosa de 

 scribed by Fabricius. If Wiedemann' s species is meant, the 

 synonymy is- incorrect. That author mentions both sexes, in 

 which he was evidently mistaken, for he describes only the $ . 

 The 9 of formosa Wied. has the abdomen orange on the basal 

 half, while lanipes is entirely coal-black. 



T. pennipes Fab. This is Fabricius's Dictya pennipes (Syst. 

 Antl., 327, 5). It is found over the eastern half or more of 

 the United States and in Mexico. All the descriptions are of 

 the $ . Say's Phasia jugatoria is the 9 of this species. Baron 

 Osten Sacken, in his note on Say's description, has the sexes 

 changed. Say described the 9 . It is the $ that has the fer 

 ruginous or yellowish patch on the front of the wing, and the 

 abdomen entirely ferruginous, though males also occur which 

 have the abdomen faintly tipped with black. This (Say's 

 jugatoria) is probably the same sex of the same species which 

 Fabricius described as ciliata. 



T. plumipes Fab. All the descriptions (Fab., Wied., Rob. 

 Desv.) are of the 9 . The only difference between this species 

 and lanipes seems to be that this has golden and lanipes white 

 lines on the thorax. If this difference does not exist they are 

 probably the same. I have never seen this species. 



T. pyrr/wgasterWied. The description seems to be of the 9 . 

 Mr. van der Wulp records this species from Guatemala (Biol. 

 Cen tr.- Am.), and Mr. von Roder records it from Porto Rico. 



T. radiata H. Lw. This is our largest and most striking 

 species. Loew described the $ . I am confident that I have 

 the 9 in two specimens which have the sides of the face silvery 

 instead of golden, the wings entirely black and the abdomen 



