305 



3. 



Larger species, 1.75-2 mm,; anterior lateral angles of mesonotiim 

 inconspicuously or not at all yellow in female ; antenna with sec- 

 ond joint and basal joint of flagellum yellow in female, only the 

 apical 3 joints in male conspicuously elongated 1. fusculus. 



Smaller species, 1-1.5 mm. ; anterior lateral angles of mesonotum in 

 female generally broadly yellow, and occasionally a patch of yel- 

 low in front of scutellum also ; antennae with base fuscous in fe- 

 male, the apical i joints in male conspicuously elongated. .2. levis. 



Wing with first vein almost fiLsed wdth third, not quite reaching 

 middle of third ; antepenultimate joint of antenna in male about a 

 third longer than preceding joint (15 : 11) 3. fusinervis. 



Wing with first vein distinctly separated from third, connected with 

 it by a cross vein and less than a third the length of third ; ante- 

 penultimate joint of antenna in male nearly twice as long as pre- 

 ceding joint (17 : 9) 4. peregrinus. 



Comparative Lengths of Apical four Antexnal Joints of Males.* 



*The measurements are comparative, and v^ere made with a compound micro- 

 scope fitted with a H in. objective and a No. 4 Bausch and Lomb eyepiece. The 

 scale, divided into tenths of a millimeter, fitted to eyepiece. 



I. Ceratopogon fusculus Coquillett 



Ceratopogon fiisculus Coquillett, Proc. U. S. Nat. Mus., Vol. 23, 1901, p. 605. 



Larva. — Length, 2.5-3 "i"!- Yellowish, the dorsum covered with 

 minute black spinules causing the surface to appear brown. Antennae 

 prominent, though not longer than half the width of head, borne upon 

 slightly raised bases, and apparently consisting of two joints, the basal 

 joint thick and slightly more than half the length of the apical one, the 

 latter at base barely more than half as thick as basal joint, slightly 

 tapering to apex; eye spot distinct; mandible with three distinct teeth, 

 somewhat similar to those of Forciponiyia spccularis but more dis- 

 tinctly rounded apically. Dorsal outline of larva and arrangement of 

 bristles as showni in Figure 4, Plate XVII, the surface covered with 

 microscopic spinules; thoracic and anal pseudopods distinct, each 

 armed with two circles of strong hooklike claws, those of the central, 

 or apical, series much more slender and darker than those of the outer, 

 or subapical, series. Ventral surface with the spinules less closely 

 placed, and without bristles except the two on the projecting lateral 



