AMERIOAN DIPTERA. 35 



tlioracic dorsum is a pair of indistinct, less pollinose stripes. Antennae wholly 

 yellowish red; tiie cheeks and the lower part of the face obscurely yellowish, in 

 the middle of the face below the antennae there is an oval space which is evenly 

 pollinose, free from the black dots. Wings hyaline, with two conspicuous blackish 

 spots; the larger one beginning in the subcostal cell at tip of auxiliary vein, 

 thence more broadly along the marginal cell, the base of the submarginal cell for 

 a third of its length, and less distinctly opposite this on the cross-vein and base of 

 first posterior cell ; the smaller spot reaching from the tip of the first longitudinal 

 vein nearly to the third; veins black, brown toward the base. Legs yellowish 

 red; the front femora on basal half, and the other femora except the tips black; 

 the front and hind tarsi brown. 

 One specimen, New Mexico. 



EXPLANATION OF PLATE I. 



Fig. 1, la. — Mi/elaphus melas Big. 



Fig. 2. — Ceraturgus cruciatux Say. 



Fig. 3. — Dioctria nitida n. sp. (antenna.) 



Fig. 4. — Dicolonus simplex Lw. 



Fig. 5, 5a. — Oupriocerus Aeacus Wied. 



Fig. 6, 6a. — Triclis tagax n. sp. 



Fig. 7. — Microsij/lum gnlactodes Lw. 



Fig. S. — Habropogon bi/ineatus n. sp. 



Fig. 9. — ? Cyrtopogon {? Holopogon) gibber n. sp. 



Fig. IQ.—Cyrtopogon n. sp. 



Fig. 11. — Cj/rtopogon n. sp. 



Fig. 12. — Calllnicus calcaneum Lw. 



Fig. 13. — Nicocles politics Say. (Abdomen of male.) 



Fig. 14, 14a, 14b. — Nicocles abdominalis n. sp., (wing, abdomen of male, and 



hind leg). 



Fig. 15. — Nicocles ru/us n. sp. 



Fig. 16.— Nicocles dives Lw. 



EXPLANATION OF PLATE II. 



Fig. 1, la. — Nicocles scitulus n. sp., (wing and hind leg). 



Fig. 2, 2si. — Taracticus octopunctatus Lw., (head and hind leg). 



Fig. 3. — Taracticus brevicornis n. sp. 



Fig. 4. — Lestomi/ia sabulonntn 0."S. 



Fig. 5. — Lestomyia n. sp. 



Fig. 6. — Deromyia Winthcmi Wied. 



Fig. 7, 7a, 7b. — Hi/perechia atrox n. sp., (head, wing, and hind leg). 



Fig. 8. — Atomosia paella Wied. 



Fig. 9. — Pogonosoma dorsaia Say. 



Fig. 10. — Asilus sericeus Say. 



Fig. 11. — Mallophora laphroides Wied. 



Fi^. 12. — Ommatius tibialis Say. %. 



Fig. 13. — Proctaranthus heros Wied. 



Fig. 14. — Promachus n. sp. 



Fig. 15. — Nausigaster punctulata n. sp. 



