J. R. MALLOCH 181 



aiul tho hind til)i:i with two aiitero-ventral liristles instead of 

 one. 



Pegomyia quadrispinosa sj:). ii. 



Male. — Similar to ."nibgrlscci in color; the oheeks and parafarials rcMldish, 

 abdomen entirely black, fore femora and coxae almost entirely' black. 



Eyes separated by over twice the width across posterior ocelli; each orbit 

 with seven or eight bristles on anterior half; arista with its longest hairs a 

 little longer than its basal diameter; profile as in fiiibgri.sea. Thorax with 

 two pairs of strong presutural acrostichals; post-humeral dui)licated. Pro- 

 cesses of fifth sternite longer than in the preceding species, but in other re- 

 spects similar. Fore tibia with one antero-dorsal and one posterior bristle; 

 mid femur as in subgrisea; hind femur with a series of strong, rather irregular, 

 and somewhat closely-placed bristles rn)m base to apex on antero-ventral 

 surface, and a few similar bristles on basal half of postero-ventral ; hind tibia 

 with two or three antero-ventral, two antero-dorsal and two postero-dorsal 

 bristles. Wings as in subgrisea. 



Female. — Differs from the male in having the fore femora with a fuscous 

 stripe on postero-dorsal surface. 



Frons over one-third of the head-width; interfrontalia without cruciate 

 bristles; orbits bare except for the strong bi-istles. 



Length, 7 to 8 mm 



rypc—d"; (iallatin, Montana, July 9, 1900, [Illinois]. AUo- 

 h/pe. — 9 ; Monida, Montana, Juno 27, 1913. 



Pegomyia fringilla sp. n. 



Male Black, slightly shining, thorax and abdomen with drab-gray pruines- 



cence Parafacials ami cheeks brownish; palpi and antennae black. Thorax 

 with four black vittae. Abdomen with a rather broad black dorso-central 

 vitta, which is slightly interrupted at posterior margin of each tergite. L(>gs 

 black, hind tibiae reddish. Wings clear, veins black, paler basally. Calyp- 

 trae dull yellow. Halteres yellow. 



Eyes large, separated at narrowest i)art of frons by about the width of 

 anterior ocellus; parafacial at base of antenna about half as wide as third 

 antennal joint, narrowed below; cheek about as high as width of third an- 

 tennal joint, with a series of bristles along the lower margin, two or three 

 of those near anterior margin upwardly curved; vibrissal angle not produced; 

 arista almost bare. Thorax with three pairs of acrostichals and some short 

 hairs in front of suture; prealar about one-fourth as long as the bristle behind 

 it; sternoplem-als 1:2. Abdomen depressed, rather broad, sides subparallel; 

 hypopygium small; processes of fifth sternite short, narrow, slightly chitinised 

 apieally, with their inner margins spar.sely fringed with short hairs on basal 

 half, and no long surface bristles. Fore tibia with a posterior median bristle, 

 the apical dorsal and posterior bristle of moderate size; fore tarsus slender, 

 longer than tibia; mid femur with three or four bristles on basal half of i)ostero- 

 ventral surface, mid tibia with one antero-dorsal, one jjostero-dorsal ami 



TRANS. AM. KNT. SOC. XLVI. 



