CULISETA ALASKAENSIS 499 



long, slender, brown scales; lateral scales narrowly lanceolate, median truncate but 

 slender, aggregated so as to form four small but distinct spots, occurring at the root 

 of the second, the bases of the fork cells, and at junction of cross veins; first sub- 

 marginal cell about one-third longer and a trifle narrower than second posterior, both 

 stems about one-half the length of the latter; cross-veins nearly of one length, and 

 almost in a line; ventral scales long and slender; halteres, light stem, dark knobs. 



Male. Much as female; antennae give banded appearance; verticels light brown; 

 palpi as long or longer than proboscis, dark brown, with a light band at base of 

 apical joint, plumes brown except at the light band, where they are yellowish; very 

 marked contraction at the distal end of the second abdominal segment, giving a 

 " wasp waist " effect; legs as in female, but the bands distinct and fairly wide, espe- 

 cially on the hind legs, where there is a narrow band on the third tarsal; in the fore 

 and mid legs this joint has only a suggestion of a band; fourth joint brown; ungues 

 large, unequal in fore and mid legs, the larger biserrate and the smaller uniserrate, 

 in hind legs large, simple and equal. 



Length, 10-11 mm. Habitat, Fort Egbert, Alaska. Taken May-June. 



Type: No. 9959, U. S. N. M. 



Described from five females and one male sent me by 1st Lieut. J. R. Bosley, Asst. 

 Surg. U. S. Army, in two collections from Fort Egbert, Alaska. 



It is closely related to both annulata, Shrank, Falbici, No., and penetrans, 

 Desvoidy. Differs from the former in that it has only the tiny spot on the thorax; 

 there is no band on the female palpus, and only one on the male; there is no ring 

 on the femur, and the log bands are much narrower and ochraceous rather than 

 white. 



It differs from Falbici also in the thoracic marking; the palpi are only white 

 scaled; the median stripe on the second abdominal segment; the tarsal bands are 

 basal only, and the mid ungues of the male have only one tooth on the smaller. It 

 apparently reverses the colouring of penetrans, and has only four " maculis plus 

 minusve distinctis." 



Description of Female and Male of Culiseta alaskaensis (Larva Unknown) : 



Female. Proboscis slender, long, hardly dilated towards tip, labellfe long, 

 tapering; vestiture dark brown with scattering light-gray scales, particularly 

 towards base beneath. Palpi short, about one-fifth the length of proboscis ; 

 black scaled, a few white scales intermixed, particularly at the segmentations, 

 tips white. Antennfe filiform; tori globose, with an apical depression, bright 

 chestnut brown ; second segment with a median whorl and scattered hairs, the 

 others subequal, with basal whorls of sparse rather short sefee and silky gray 

 pubescence. Clypeus convex, rounded triangular, dark brown, pruinose. Occi- 

 put blackish, rather sparsely clothed with narrow, curved whitish scales, slender, 

 erect, forked blackish brown scales, most numerous posteriorly, margins of 

 eyes and cheeks white scaled; many coarse black bristles towards margins of 

 eyes, most numerous dorsally. 



Prothoracic lobes remote with whitish scales and pale bristles. Mesonotum 

 very deep brown, vestiture of larger, narrow, curved, creamy-white and smaller 

 dark-brown scales, the whitish scales forming confused lines submedianly and 

 near lateral margins, two distinct patches on the disk, others around ante- 

 scutellar space and over roots of wings. Scutellum trilobate white scaled, with 

 three groups of long black setae. Postnotum nude, shining dark brown. Pleurse 

 and coxae brown and blackish, with patches of white scales. 



Abdomen subc3dindrical, truncate at tip; black scaled above, the segments 

 with white basal bands, occupying almost a third of the segments; first seg- 

 ment with a patch of white scales and numerous pale bristles; venter white 

 scaled. 



Wings ample, hyaline, with smoky spots at base of second vein and upon 

 cross-vein ; scales of veins dark brown, a few light colored scales intermixed on 

 the costa; both sets of scales on veins narrow, the outstanding ones much 

 longer ; scaling more dense and of broader, truncate scales on first vein, dense on 

 furcations of second and fourth veins, at cross-veins, and at base of second vein, 

 producing the effect of spots in those places; cross-veins incident, scaled on 



