F. P.. -".'OLE 43 



50THRA 



Sotkri Westwood, Trana. Eai. So-:. LG^iori. p. 514^ (1876 . 



rXransL; "Proboecis short. Antennae small and with, fur 

 terminal setae, inserted on the lower face. Eye^ . .n 



front, hairy. Two oceDL Dorsal prothoracic . - :. 



Abdomen hemisphericaL Wing veins arranged as in Pterodontia. 

 cost a, however, not at all spurred, discoidal cell furnished with a 

 short external appendicijlate vein." 



The type of the genus is -V. bieoior from Australia. 



B'othra americana 



So'.Kra a'^rA'n.cnr/i Bigot. -'■ "' '-- ^- 1S'S9. p. 320. 



(Trai^Lj "Airtemiae falvoce, tte first jomt blackMi; tke eyes cov^ed with 

 kxig black hair; thoras. - " ; - shining black and black pilcee; squamae 

 tdiitish, the bordss bla:.:- -^n reddish .rhinlv covered) with broTsnish 



hair, the base of the fir^t 3Ji.i second segments omamaired ■svith a large 

 triangular spot. M^icfc. veri^er with band" of the same c-olor: coxae ^kck the 

 hair black; I-- ~, ba^e of the middle and poe* ' 



blackish; the - _ ^^vdoped; wings tinge^i ^-^ i ve_ 



the outer border grayishj the v ei n s brown. 



"Hab. Boreal America - Wash. Territory. Onr :ir -_r:i. .t. the FrrnA 

 Museum.'' 



As previously stated the occurrence of this genus in North 

 America is verj' doubtful. I have never seen a specimen of 

 Xothra, but from the description it is very close to Pterodoniia. 

 Bigot probably had a species of Pterodontia. In fact P. mi.<<lla 

 O. S., from the same locahty. fits the above description, and the 

 female has no spur on the wing at the end on the first vein. 



OPSZBirs 



Opsebius A. Costa, Rendic. d. So-;-. R. B4-jrboa. Acad.. Xapoli, v., p. 20, (18-56). 

 Pithogaster Loew, Wien. Ent. Monatschr.. i, p. 22. 1S57). 



The head is small and far down o:. rax so that it can 



hardly be seen from above. The eyes are hairy and in large 

 part holoptic; the occiput is swoUen. The proboscis is very 

 short and the mouth-parts atrophied. The antennae are in- 

 serted on the vertex as in Acrocera, but are much longer as a rule 

 and the arista even more slender. There are three oceUi, the 

 front one least conspicuous. The hmneri are widely separated. 

 The thorax is ver>- laige and bulging, almost spherical in shape, 

 and clothed with thick fur-like hair. The pleura are swollen 



TEAXS. Ail. EXT. SOC. XLV. 



