N. . 1 Lso. NFAV NORTH AMERICAN DIPTERA—COQUILLETT. 93 



N\ iiio-; leo-s only pubescent, first joint of front tarsi a})out half as long 

 ;is the tibiw, fourth tarsal joint rather slender and almost as long- as 

 the fifth; length, 1.5 mm. A female specimen collected August 7 Iw 

 Mr. H. S. Barber. 



Habitat. — Las Vegas Hot Springs, New Mexico. 



Tyj^e.—C^t. No. 6172, U.S.N.M. 



ORTHOCLADIUS PLATYPUS, new species. 



l)lack, a large dull 3"ellowish humeral spot, halteres, trochanters, and 

 extreme bases of femora 3^ellow- hairs of antennae dark gray, thorax 

 (»l)a(|ue, grayish pruinose; tarsi only pubescent, the fourth joint 

 dilated, emarginate at the apex, noticeably shorter than the fifth, first 

 joint of front tarsi three-fourths as long as the tibia?; wings hyaline, 

 small crossveins not darker than the adjacent veins, not clouded with 

 brown, third vein be3'ond its middle slightly bowing toward the costa; 

 h'ligth, 2.5 mm. A male specimen collected July 6 by Mr. H. S, 

 Barber. 



ffahltat. — Flagstaff, Arizona. 



7}//>6^— Cat. No. 6173, U.S.N.M. 



ORTHOCLADIUS POLITUS, new species. 



Head yellow, antennas brown, its hairs yellowish brown; thorax 

 yellow, thi-ee vittse on mesonotum, spot ))elow each wing, the breast 

 and metanotum black, mesonotum highly polished, scutellum brown- 

 ish yellow, polished, its base opaque blackish; abdomen j^ellowish 

 l)rown, becoming darker toward the apex; legs brown, trochanters 

 and extreme bases of femora yellow, middle and hind tibia? and 

 ^ bases of their tarsi dull yellowish, legs only pubescent, fourth tarsal 

 .; joint slender, as long as the fifth, first joint of front tarsi three-fourths 

 ras long as the tibia?; wings hyaline, small crossvein not darker than 

 I the adjacent veins, third vein ahnost straight; halteres yellow; length, 

 ^ 2.5 mm. A male specimen collected flune 6 b}^ Mr. H. S. Barber. 

 \ TTahitat. — Washington, District of Columbia. 

 I Type.—Q,2X. No. 6174, U.S.N.M. 

 f 



:} CRICOTOPUS VARIPES. new species. 



Head and its mem))crs black, hairs of antenna? gray; thorax black, 

 mesonotum highly polished, metanotum and scutellum opaque, velvet 

 black; abdomen velvet black, the first two segments and hind margins 

 of the following two polished yellow, genitalia yellow; femora black, 

 tlir extreme bases and trochanters yellow, front tibia? and tarsi ])r()wn, 

 the former with a broad median white ])and, other tibiie and tarsi 

 yellow, tluMr apices brownish, legs only pubescent, first joint of front 

 tarsi two-thirds as long as the tibia>; wings whitish hyaline, small 

 crossvein slightly darker than the adjacent veins, third vein almost 



