383 



tarsi very large, extending for their entire length beyond apices of 

 wings and to base of third abdominal segment. Dorsal abdominal 

 segments 1-7 each with a transverse series of short, stout, closely 

 placed teeth, the lateral extremities of each series replaced by a series 

 of 4-6 bristles ; eighth segment with a widely separated pair of stout 

 thorns; postspiracular bristles 4—5 in number, of very uneven strength, 

 the lower one usually much stronger and longer than the strongest of 

 the others ; spiracles very slightly raised, openings almost round ; 

 apical segment with 4 slightly claw-like thorns, the upper pair much 

 more widely separated than the lower ; ventral segments each with a 

 transverse series of bristles, the series becoming progressively stronger 

 to eighth segment ; apical segment unarmed ventrally. 



The foregoing larA'al description was made from a specimen with- 

 out data submitted by Dr. Edna Mosher for identification. The pupa 

 was described from the exuvia of a male and female taken at White 

 Heath, 111., June 11, 1916. I found the specimens projecting from 

 the decayed base of an apple-tree in a yard belonging to F. M. Peel. 

 I did not find any imagines. June 2 I found one pupal skin in this 

 locality, which I unfortunately lost, but as no others were visible on 

 that date, the imagines must have emerged from the described exuvia 

 during the interval from June 2 to June 11. 



Adhering to the apical segment of one of the pupae, I found a 

 portion of the larval exuvium. Unfortunately the head is missing, 

 as is also a portion of the caudal extremity, but there is no doubt that 

 the larva I have described here is that of this species, as there is a 

 portion of the apical segniient of the exuvium which agrees with that 

 of the described larva. 



Promachus Loew 



I have before me the larvae of two species of this genus and 

 tlie pupae of three, as listed in the foregoing keys. I can not give a 

 summary of larval characters that can be depended on to separate the 

 species of this genus from all other Asilidae, but the pupae are readily 

 identified by the form of the thoracic spiracles, which have no ele- 

 vated, well-defined reniform area, thus differing from all other genera 

 known to me. 



Promachus fitchii Osten Sacken 



Promachus fitchii Osten Sacken, Cat. Descr. Dipt. N. A., see. ed., p. 234." (1878) 

 Tnipanea apivora Fitch, Third Eep. N. Y. State Ent., p. 251. Preoccupied. 

 (1859) 



The larva of this species differs very greatly from that of P. ver- 

 tebratus, being comparatively short and stout, with the segments very 



