310 

 I. PsEUDOCULicoiDES MUTABius Coquillett 



Ceratopogon mutahilis Coquillett, Proc. U. S. Miis., 1901, Vol. 23, p. 604. 



Male. — Black. Head black, antennal plumes brown-black. Mes- 

 onotum on anterior half and lateral margins with whitish pruines- 

 cence, which viewed from behind takes the form of two central vittse 

 which dilate laterally at middle of disc, posterior to which point the 

 surface is shining, a very distinct pruinose patch surrounding a black 

 spot on either anterior angle ; scutellum, a small spot below wing-base, 

 and another on anterior angle orange-yellow. Abdomen opaque black. 

 Legs blackish brown, bases of tarsi and sometimes apices of tibise yel- 

 lowish. Wings clear, costal and radial veins, especially at apices, black, 

 the other veins pale; surface hairs brown. Knob of halteres white. 



Antenna slightly longer than head and thorax combined, apical five 

 joints as in Figure 2, Plate XX. Mesonotum with sparse brownish 

 setulose hairs on margins and on spaces between the vittae ; scutellum 

 with 5-6 black setulose hairs on apical margin. Hypopygium as in 

 Figure I, Plate XX. Legs slender, surface hairs long and slender, 

 those on hind tibiae and tarsi at least four times as long as the joints 

 which bear them; basal joint of hind tarsus as long as the next three 

 combined ; fifth nearly one half longer than fourth ; claws simple, half 

 as long as fifth joint; empodium small. Wings slender; costa to mid- 

 dle ; first vein coalescent with third for a distance equal to twice that 

 from its apex to apex of third, joining costa at nearly a right angle ; 

 media forking at cross vein ; cubitus forking in vertical line with apex 

 of third vein. 



Female. — Similar in color to the male, but the yellow thoracic 

 marks are always more distinct. 



The antennae are short-haired, and their entire length barely ex- 

 ceeds that of head and thorax combined, the last five joints being but 

 slightly elongated and the apical joint swollen. The abdomen is stouter 

 than that of the male, and the surface hairs much shorter. The sur- 

 face hairs on the legs are less conspicuous than in the male, while the 

 wings are less elongate. 



Length, 1-1.5 mm. 



Illinois localities: Havana, April 29, 1914; Urbana, July 2, 1914, 

 at light; Grand Tower, April 21, 1914; Ashley, April 25, 1914; Du- 

 bois, April 24, 1914; and Algonquin, June 10, 1896. 



Originally described from the District of Columbia and Florida. 



Nothing is known of the habits of the adult, and the early stages 

 are undescribed. 



