ENTOMOLOGY OF COLORADO. 367 



906. Rhizococcus n. sp., under a rock, West cliff, April 23, 1890. Naked, py- 



riform, 2i mm. long, dull lilac, legs clear red-browu, antennae reddish 

 brown. Caudal filaments short, but distinct. This must be new, but 

 unfortunately the only specimen was accidentally lost, and no proper 

 description can Ije drawn up. 



DIASPIN^. 



907. Chionaspis salicis L., on willow at West Cliff. 



On lemons exposed for sale in the shops were found Mytilaspis citricola 

 and Aspidiotus nerii, but these of course do not belong to the fauna. 



DIFTERA.* 



CECIDOMYID.^. 



908. Cecidomyia rigidae O. S.. West Cliff; see " Entom." p. 1890, 278. 



909. " salicis-batatas Walsh ; see ■' Entom." 1890, p. 279. 



910. " salicis-brassicoides Walsh ; see " Entom." 1890, p. 280, 



911. '• frater Ckll., "Entom." 1890, p. 280. Type in Brit. Mus. 



912. " sallcis-nodulus Walsh ?; see "Entom." 1890, p. 75. 



913. " salicis-hordeoides Walsh ? 



914. " bigelovise Ckll., " Ent. Mo. Mag." 1889, July, p. 324 ; Aug. 

 p. 363; "W. Am. Sci." 1889, p. 106; "Ent. Mo. Mag.'" 1890, p. 109. 

 Specimens in Brit. Mus. 



915. Cecidomyia alticola Ckll., " Entom." 1890, p. 281. Type now in Brit. Mus. 



916. " albovittata Walsh? ; " Entom." 1890, p. 282. 



917. " sp., galls on Geranium; imago unknown. 



918. " ? sp., gall on Populus tremuloides. 



919. Hormomyia salicum Ckll. A problematical species, the gall only being 



known. Trans. Ent. Soc. Lond., 1890, xvi-xvii. 



MYCBTOPHILID^. 



920. Leja sp., near West Cliff. 



SIMULIID^. 



921. Sitnulium sp., attacking horses, July 8 ; see 2d Eep. Colo. Biol. Asso'n. 



CULICID^. 



922. Culex sp. 



CHIRONOMIDJE3. 



923. Ceratopogon sp., figured in 13th Rep. Colo. Biol. Asso'n ; see also 2d Eep, 



n. sp. It differs from tomentosus in the secretion of the individuals being very 

 abundant, so that they cannot easily be separated from one another, the white 

 cottony matter from several being fused together; also in the more slender legs; 

 and in the narrower and longer truncate spines or processes ; and apparently 

 in the fewer joints of the antennae. The Wet Mountain Valley insect is in all 

 probability identical with A. confusus. 



* Prof. C. H. T. Townsend has lately identified the following Diptera, collected 

 by me in Wet Mountain Valley: Sarcophaga sp., 12 mm. long, f. Cleigastra sp. 

 Schoenomyia sp. " Appears to belong to this authomyiid genus, but does not agree 

 with the characters wholly, 8 mm. long and very bristly." Jurinia algens Wd. 

 Onesia sp. ? % . Caricea sp. ? f . Cyrtoneura sp. 9 . 



TRANS. AM. ENT. SOC. XX. DECEMBEK, 1893. 



