OSTEN SACKEN ON WESTERN DIPTERA. 191 



Families CULICIDiE, CHIRONOMID^, PSYCHODID^. 



Half a dozen species of Cidex, two Anoplieles^ and two Gliironomus are 

 among my collections from California. They all exhibit the characters 

 and coloring peculiar to the species of these genera in other countries. 

 A Culex from Southern Oaliforuia is distinguished by very sparsely 

 bearded antennae of the male and a peculiar structure of the palpi. 



PSYCHODA sp. — A siugle specimen ; San Kafael, Gal. 



In the absence of any remarkable western forms, I describe two new 

 species from the Atlantic States. The first belongs to the little known 

 genus Aedes {CuUcicJce), of which only one si)ecies was known to occur 

 in the United States. The other is a second species of the new genus 

 Ghasmatonotus {CMronomidce) established by Dr. Loew for a species 

 which I discovered in the White Mountains. 



Aedes fuscus u. sp., S 2 . — Brown ; thorax clothed with a short, 

 appressed, brownish-golden tomentum ; abdomen with whitish-yellow 

 narrow bands at the base of the segments ; venter whitish-yellow. 

 Antennae black ; proboscis and legs brownish, with a metallic reflection ; 

 femora paler on the under side ; pleurae under the root of the wings 

 with a spot clothed with whitish scales. Long. corp. 3-4'^'". 



Hah. — Cambridge, Mass., in May. 



Obs. — I bred this species from larvre which I found in a pool together 

 with those of several species of Culex. The lar^?e and pupre behaved 

 exactly like those of Culex, and only attracted my attention by their 

 smaller size. If I could have known beforehand that they belonged to 

 Aedes, I would have compared them more closely with the larvce of 

 Culex. The metamorphosis of Aedes has never been observed before. 



Ghasmatonotus bimacui/Atus n. sp., <? .—Black ; wings of the same 

 color and with two large white spots. Length about LS"""^. 



Black ; thorax shining ; base of the abdomen laterally pale greenish- 

 yellow. Feet black ; front coxse and' base of all the femora yellowish ; 

 the first tarsal joints are of the same pale yellowish color, except the 

 tip, which is black. Knob of halteres greenish. Wings black; the 

 first white spot is in the shape of a cross-band between the second vein 

 and the anal angle; the second spot is square, and situated on the hind 

 margin, within the fork of the fifch vein. 



Sa&.-^-Catskill Mountain House, in July, 1874; numerous male speci- 

 mens ; Quebec (Mr. Belanger). 



The first posterior cell and the cell withiu the fork of the fifth vein 

 are much longer here than in C. unimaculatus Lw., and the latter cell is 

 larger and broader. Heuce it happens that although in both species 

 the cross-band-like spot is placed immediately inside of the proximal 

 end of the fork, it occupies the middle of the wing in C. unimaculatus^ 

 and is much nearer the base in C. himaculatus. The abdomen of the 

 male ends in a comparatively large and conspicuous forceps (the 

 " hypojjygium maris glohosum " in Mr. Loew's description of C. unimacu- 



