NORTH AMERICAN DIPTERA. 299 



Three specimens, North Park, Colorado. This is certainly dis- 

 tinct, and probably is J. ait Ida v. d. Wulp. (Notes from the Ley den 

 Museum, iv, 82). 



In numerous females from most of these localities the palpi seem 

 to be uniformly more, the third antennal joint less dilated. The 

 front tarsal joints are considerably dilated ; in the male these joints 

 are angular. In the females from North Park, Colorado, the third 

 antennal joint is truncate, angular, but less dilated than in the males ; 

 the aristal joints are likewise elongate, and the epistoma more promi- 

 nent. 



Jurinia (Fabrieia) hystrix Fabricius, Syst. Entom. 777, 21 (Musca) ; Ent. 

 Syst. iv, 325, 55 {id.) ; Syst. Antl. 310, 8 (Tachina) ; Wiedemann, Auss. Zw. ii, 

 283, 6; Macquart, Hist. Nat. Dipt, ii, 79, 30 (Echinomyia) ; Jurinia metallica E. 

 Desvoidy, Myod. 35, 



Specimens that I identify as this are all larger than the size given 

 l)y Wiedemann, reaching a length of as many as seventeen millime- 

 tres. In the material I have I distinguish three forms or species, as 

 follows : 



a. % . — Front with a single row of bristles on each side reaching below the 

 base of the antennae. (A few smaller bristles without below, and within above, 

 in both sexes, are not considered as forming a distinct row.) Third joint of the 

 antennae a little longer than the second ; palpi yellow. 



9 .—Front with a single row of bristles extending below the base of antennae, 

 and exteriorly with two strong anteriorly directed ones. Front tarsal joints very 

 much dilated. 



Hab. — Connecticut, New York, Florida, Colorado, New Mexico. 

 The antennre vary much in color and the third joint appears to be 

 usually smaller in the female. 



h. % . — Front much narrower, antennae black, the thii'd joint smaller, not lon- 

 ger than the second, palpi more blackish. 



One specimen. North Carolina. 



c. 9-^Like the females of a, but the front tarsal joints not dilated. The 

 claws, pulvilli and bristles of the front are as in the other females. 



One s])ecimen, Connecticut. 



This specimen would seem to be related to the genus Mikia Kowarz, 

 and must resemble M. magnifica Mik. The second joint of the an- 

 tennse is, however, more slender. 



All the above mentioned specimens agree in having a row of stout 

 spines on the posterior borders of the second and third abdominal 

 segments. 



