58 • COSTA RICAN DIPTERA 



Discocerina leucoprocta subspecies incisa Coquillett 



1902. Discocerina incisa Coquillett, Journ. N. Y. Ent. Soc, x, 182. 



Very similar to the typical form. However, the face is nar- 

 rower, yellowish with broad, conspicuous silvery orbits, the third 

 and fourth abdominal segments with basal angles cinereous and 

 more or less encroaching on the dorsum. The second and third 

 costal sectioYis subequal. 



The typical form, leucoprocta, may be distinguished from the 

 other species by the opaque, black abdomen, with the ventral 

 lobes and apical segment silvery white in contrast. 



This form is represented by eighty-four specimens from the 

 following localities: Alajuela, September 15; ? Banana River, 

 November 9, (at upper reservoir) ; Bonnefil Farm, Rio Surubres, 

 October 20; Cartago, July 4 to 27; Filadelfia, January 18, (along 

 muddy beach of Rio Tempisque); Guacimo, June 6; Irazu, South 

 slope near Cartago, December 15, (over mud); Peralta, March 

 24, (over muddy road), Turrucares, December 22, (over mud); 

 Rio Siquiares, December 19; Small stream north of Rio Siquiares, 

 December 20, (over mud) ; ? Rio Reventazon on Irazii, near Car- 

 tago, April 24. 



Discocerina setiilosa new species Pi. Ill, fig. 16. 



Black; third antennal joint, palpi, apices of femora, fore tibiae, extremities 

 of middle and hind tibiae, and all tarsi, pale. Halteres white. Wings hyaline 

 or grayish with costa and veins black. 



Opaque or slightly shining above. Frons, mesonotum and scutellum brown 

 or olivaceous, inchning to ochreous; abdomen slightly so in certain aspects. 

 Narrow frontal and broad facial orbits, and cheeks, silvery; upper part of face, 

 occiput, post-alar spots, pleura, venter and femora, grajdsh to blackish. 



A series of out-curved bristles laterad of the usual facial bristles and diver- 

 gent with them. 



Type. — cf ; Filadelfia, Costa Rica, January 18, 1910, (muddy 

 beach of Rio Tempisque), [Type No. 6133]. Paratype. — 1 9 ; 

 topotypical. 



Discocerina obscurella subspecies parva Loew 



1862. Discocerina parva Loew, Mon. N. Am. Dipt., i, 146. 



A race distinguished by the black, evenlj* dusted face, pale 

 orbits, opaque or semi-opaque mesonotimi and frons, and a some- 

 what contrasting black abdomen, which is generally more or less 

 polished apically. 



