A REVISION OF THE GENUS LEPTOCONOPS, SKUSE. 17 



Habitat. U.S.A. — New Mexico: Continental Divide, 7,000 ft., 21st June, 

 (C. H. T. Townsend — type serie.s), Organ Mountains, 5,700 ft., 29th Aug. (C. H. T. 

 Townsend — o described above) ; Las Vegas Hot Springs {H. S. Barber— ,^ described 

 above) . 



Dr. Aldrich informs me that, besides the locahties mentioned above, the Leptoconops 

 material in the United States National Museum includes females from Arizona, 

 Colorado, Florida, Texas, Utah and Cuba, and males from Arizona. The specimens 

 from Utah are L. kertcszi var. americanus, nov., but the others have not yet been 

 definitely determined, and are provisionally referred to L. torrens. 



Pratt (1907) mentions several of the foregoing localities, including Utah, in 

 connection with L. torrens. 



Lsptoconops bezzii, Noe. 



Mycterotvpiis bezzii, Noe, Atti R. Accad. Lincei, Ser. 5, Rendiconti xiv p. 114 

 '(1905)"; Arch. Zool. Napoh, iii, p. 137 (1907). 



Leptoconops hyalinipennis, Kieff., Ann. Mus. Nat. Hung, xvi, p. 33 (1918). 



The following description of L. bezzii (?) is drawn up from specimens collected in 

 Central Italy and sent me by Professor M. Bezzi ; to this gentleman I am also 

 indebted for the loan of microscopical preparations of the palpi and antennae of 

 the type male. 



$.— Length of body (two specimens), 2-1 mm. ; length of wing, 1 -2 mm. ; length 

 of antenna, 0-56 ; width of head, 0-45 mm. 



Head black, clothed on the vertex and occiput with short dark hairs ; clypeus 

 black or blackish brown, with two pairs of short dark hairs ; eyes moderately widely 

 separated, the space between them about one-quarter the width of the head ; frons 

 with a pair of short hairs near the lower margins of the eyes. Proboscis dark brown. 

 Palpi dark brown, with dark hairs ; third segment strongly incrassate, the orifice of the 

 sensory pit very large, narrowly oval, extending almost the entire length of the inner 

 side ; fourth segment subcylindrical, slightly shorter than the third. Antennae 

 dark brown, with short dark hairs and clear spines, which are somewhat strongly 

 curved on the distal segments ; fourth to thirteenth segments transversely oval to 

 subspherical, the length from 0-8 to 1-0 the breadth; fourteenth segment about 

 two and one-quarter times as long as broad, equal in length to the preceding 

 two and one-third segments together. Thorax black, sparsely clothed with 

 short black hairs; scutellum black, with three pairs of dark bristles (one of the 

 small lateral bristles sometimes wanting) ; postscutellum, pleurae and pectus black. 

 Wings white, iridescent, the anterior veins arranged as in fig. 8,/; fifth vein bifurcating 

 slightly beyond the end of the costa. Halteres white. Legs dark brown or brownish 

 black, the metatarsus and second tarsal segment paler, yellowish brown, each with a 

 pair of apical spines. Claws (fig. 4, d) equal, each with a stout basal tooth. Abdomen 

 dark brown, clothed with short black hairs. Lamellae yellowish brown, 0-2 the 

 length of the wing. Spermathecae two, heavily chitinised, oval (70// by 54/<) ; the 

 commencement of the duct only chitinised. 



The male obtained and associated with this species by Noe differed from the 

 female chiefly in regard to the palpi, antennae, claws and wings. The antenna 

 consists of fifteen segments, the third {i.e. the first segment of the flagellum) being 

 produced basally into a relatively long stalk, and causing the flagellum to be more 

 distinctly separated from the basal segments than in the female ; the fourth to 

 thirteenth segments become progressively longer and narrower, the most proximal 

 segment being very short and broad (0-4 to 0-7 the length), with chitinous thickenings 

 on the distal margins, the thirteenth subspherical basally but produced anteriorly 

 (2416) 



