300 



marks, there is a row of three spots, the posterior one on posterior 

 lateral angle of disc, the second slightly beyond middle, and the an- 

 terior one in transverse line with the posterior extremity of the dis- 

 tinct portion of the central vittae ; in transverse line with the sec- 

 ond spot and slightly laterad of it there is a similar spot, and anterior 

 to it and in transverse line with the space between the second and an- 

 terior spots of the inner row there is another; anterior and lateral 

 margins also with distinct pruinescence ; scutellum with a whitish 

 pruinose spot on each side (PI. XXIII, Fig. i). Abdomen with indi- 

 cations of a lateral series of black spots, one on each segment. Legs 

 brown, mid and hind femora with a narrow subapical ring, all tibiae 

 with a basal ring, the apices of mid and hind tibi^, and the tarsi mostly 

 yellowish. Wings as in Figure 4, Plate XXII. Halteres pale yellow. 



Eyes contiguous ; antennae slender, basal eight joints of flagellum 

 distinctly longer than their diameter (2 : i), sensory hairs about one 

 and a half times as long as the joints, whitish, apical five joints much 

 elongated, ninth more than twice as long as eighth, apical joint slightly 

 swollen and about one fourth longer than subapical, entire length of 

 antenna nearly twice that of head and thorax combined ; antepenulti- 

 mate segment of palpi much as in sangiiisiigus. Mesonotum with sparse 

 pale discal hairs, and a few longer black bristles on margins and on 

 spaces between the vittas and the submedian row of spots; scutellum 

 with about 6 long and a few short hairs. Legs slender, hind tibiae and 

 basal joint of hind tarsi with long hairs ; basal joint of hind tarsi as 

 long as the next three combined; fifth joint about one and a half times 

 as long as fourth; empodium indistinguishable; claws small, equal, 

 about half as long as fifth joint, untoothed. 



Length, 1.5 mm. 



Illinois locality, Dubois, April 27, 1914. Taken with sanguisugus 

 on a horse by the writer. One specimen. 



Originally described from specimens obtained at Medina, Ohio. 



Early stages undescribed. 



5. CuucoiDEs ste;i.lifer Coquillett 



Ceratopogon stellifer Coquillett, Proc. U. S. Nat. Mus., 1901, Vol. 23, p. 603. 



Male. — Similar to guttipennis in general markings. The white 

 pruinose marks on the thorax are upon the same lines but compara- 

 tively larger and more generally confluent. Legs yellow, with brown 

 bands on middle of femora, on knees, beyond base of tibiae, on apices 

 of tibiae, and at bases of tarsi. Wing-markings as in Figure S, Plate 

 XXIL 



