150 NEW NORTH AMERICAN ANT HOMYIIDAE (dIPTERa) 



„rliit, the latter with long bristly hairs on their entire length; parafacial 

 in i)rofile at base of antenna a little wider than third antennal joint, nar- 

 rowed below; vibrissa! angle with its anterior extremity in line with base 

 of antennae, the face a little concave; third antennal joint subequal in length 

 to second; arista bare, much thickened on a little less than its basal third; 

 cheek about one-fourth as high as eye (fig. 30). Thorax with numerous 

 long hairs, the dorso-centrals weak, four pairs behind suture. Abdomen 

 elongate, almost cylindrical; hypopygium small. Fore tibia unarmed at 

 middle; mid femur with a few bristles on basal half of postero-ventral sur- 

 face; mid tibia with or without one or more antero-dorsal bristles, with one 

 or two postero-dorsal and [)ostero-ventral bristles; hind femur with a series 

 of bristles on antero-ventral surface, which are weak basally, and a few bristles 

 on basal half of postero-ventral; hind tibia with a variable number of weak 

 bristles, usually from one to three on antero-ventral and antero-dorsal sur- 

 faces, and sometimes with a few setulae on postero-dorsal surface; hind 

 tarsus distinctly longer than tibia. Costal setulae longer than diameter of 

 costal vein on basal half of wing; veins three and four subparallel. Calyptrae 

 small, the lower one not very much larger than the upper. 



Female. — Similar in general color to the male, but more brownish and 

 the thoracic dorsum with four more distinct vittae. 



Eyes separated by more than one-third of the head-width; orbits wide, 

 each over half as wide as interfrontalia, with numerous bristly hairs laterad 

 of the bristles. Abdomen ovate; genitalia without thorns. Costal setulae 

 longer than in male. Length, 4 to 5 mm. 



Type. — cf; West Coast of Greonland, 1891, (Mongc^l and 

 Hughes, on the Peary Expedition), [A. N. S. P., Type no. ()22()1. 

 Allotype and paratypes. — Nine specimens, topotypical. 



Limnophora extensa sp. n. 



Male. — Differs from nh.snleta in having the ])ruinescence gray, the abdo- 

 men with large ])aired dorsal black spots, and the calyptraewhite. 



Profile as in figure 32. Eyes separated by less than width between pos- 

 terior ocelli. Thoracic chaetotaxy as in ohsoleta, the surface hairs longer. 

 Abdomen broader than in ohsoleta, the hypopygium and fifth sternite as 

 in figures 23 and 24. Legs with stronger bristles than in ohsoleta, fore tibia 

 with a few long bristly hairs on posterior surface; mid tibia with two antero- 

 and postero-dorsal bristles; hind femur with a series of antero-ventral bristles 

 and a few short bristly hairs on basal half of postero-ventral surface; hind 

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

 postero-dorsal bristles. Costal setulae short but distinc^t; fourth vein ciu'vcd 

 downward at a])ex. Lower calyptra much larger than upper. 



Female. — Differs from the female of (>li.-«)l('l<i in liaving (lie vil)rissal angle 

 much produced, the costal setulae short, and llic lower calyijtra nuu^h longer 

 I lian I he upper. 



lii'iiul li, l.."i to U mm. 



