NORTH AMKRICAN DIPTKRA. 103 



7.— Pile of head, thorax and scutelluin largely black Miiiiili' ii. sp. 



Pile of head and body whitish (males) Iiiiiiiilis. 



8.— Wings with about six brown spots on each, body not marked with black..9. 



Wings with more than six brown spots 10. 



9.— Cheeks wholly light yellow sulplnirea. 



Cheeks largely dark brown scolopax. 



10.— Face with a large black spot each side I»Uii<*li|>oiiiiis. 



Face destitute of black spots I'Keriiiiiiaiis. 



11.— Sides of scutellum and of face wholly yellow <Iiv«'r!«>a n. sp. 



Sides of scutellum and of face largely black liiiiliilis. 



I*litliiria Miiiiilc n. sp. %. — Wholly o])a(jue velvet-black, except the yel- 

 low stalk, and sometimes the knob of halteres; pile of head, thorax and scutel- 

 lum black, that of abdomen and legs whitish; proboscis projecting nearly half 

 its length beyond tip of antennai; palpi nearly half as long as proboscis; first 

 antennal joint nearly twice as long as the sect)nd, the latter as wide as long, the 

 third twice as long as the first two, in outline oblanceolate, bearing on its upper- 

 side just before its apex two short, slender, styliform processes, their tips reach- 

 ing nearly as far forward as the tip of this joint, the one nearest the tip yellow- 

 ish ; on upperside of third antennal joint are three or four rather stout bristles, 

 which are nearly half as long as this joint. Wings hyaline, apical lialf of sub- 

 costal cell yellow, f same as the 'J, , except that the color is more gray, with 

 three brownish stripes on the thorax, pile of occiput and several on thorax and 

 scutellum white, the bristles on upperside of third antennal joint only one-sixth 

 as long as that joint. Length 3-5 mm. 



Southern California. Six males and five females in February. 



I'litliiria florale n. sp. 9 same as 9 of simile, with these exceptions : 

 Sides of face, Ir.imeri and spot above each coxa yellow, that above middle coxje 

 double ; pile of head, body and legs yellow ; first antennal joint scarcely longer 

 than the second, the third nearly three times as long as the first two, of nearly 

 an equal width, but the last third tapering slightly to the tip, which is obliquely 

 truncated, its upper angle prolonged, while beneath it is a short, slender, styli- 

 form process; upperside of this joint destitute of long bristles; proboscis pro- 

 jecting two-thirds its length beyond tip of antennae; palpi scarcely one-eighth 

 as long as proboscis. Length 5 mm. 



Southern California. A single specimen in July. 



Plitliii'ia <Iiver!>ia n. sp. 'J, .--Black, the thorax and scutellum shining, 

 the halteres, extreme apex of femora, and sometimes the tibia? except at apex, 

 yellow : pile of head and entire body white ; proboscis projecting half its length 

 beyond tip of antennie; palpi one-fonrth as long as proboscis; first antennal 

 joint one and a half times as long as the second, the third nearly three times as 

 long as the first two, but slightly widening outwardly, furnished with two small 

 styliform processes on the upperside just before the a])ex, upperside of this joint 

 bearing about eight bristles, the longest of which is one-fifth as long as this 

 joint. Wings hyaline, apical half of subcostal cell yellow. 



9 • — Head yellow, a large spot at base of imtennte usually extending as a nar- 

 row irregular stripe to occiput, black ; antennse, proboscis, palpi and middle of 

 occiput black : thorax shining black, two subdorsal yellow lines greatly enlarged 



TKANS. AM. ENT. SOC. XXI. MARCH, 1894. 



