90) CLASSIFICATION OF MOSQUITOES. 
Black scales mixed with white ones on the wings; abdomen whitish or yellow- 
sealed and with a pair of black-scaled spots on some of the segments... .-- 24 
Black scales only on the wings, abdomen black-scaled, sometimes with a band 
of white scales at the bases of the segments 25 
24. Stripe of scales in the middle of the thorax deep golden brown, covering more 
than one-fifth of the width of ‘the thorax, its borders well defined. (Salt 
waterspecless )/-as2e os. eee te ae ee eee emer lativittatus Coq. 
Stripe pale brown, covering less than one-ninth of the width of the thorax, its 
borders not strongly marked, usually a narrow stripe of brown scales on each 
side of it separated by yellowish white scales. (Fresh water species. ) 
currie’ Coq. 
25. Upper side of the thorax light-yellow-scaled and with a broad stripe of black 
scales in the middle; palpi wholly black-scaled in both sexes; abdomen black- 
scaled and with a band of white scales at the base of each segment. 
atropalpus Coq. 
Upper side of the thorax not marked as above; palpi with whitish scales at the 
apices in the female and with bands of them in the male -....-..........- 26 
26. Segments of the abdomen with distinct whitish bands at their bases; scales of 
the upper side of the thorax brown and light yellowish ~~. ---- varipalpus Coq. 
Seements of the abdomen never with distinct whitish bands; scales of the upper 
side of the thoraxa wholly yellow 222s snsese aes Soe Dil 
Fipeelimdereet alm Ostet wilnolllhy aye be=s coe ears eee nivitarsis Coq. 
indsteetularceliyaolackescall CG saree se eee ae canadensis Theob. 
28. Dorsum of the abdomen black-scaled and with a band of light-colored scales at 
the base ofeach: secmentn-2 aocce c.f een ane OOS eae ee eee 30 
Dorsum of the abdomen not marked! as above ==: 524: 2= sees eee eee 29 
29) Abdomen wiolly laght=yellow-scaledi@ae: sass esses eeneree oe eee fletcheri Coq. 
Abdomen black-sealed and with white spots on the sides; thorax black-scaled 
and with four lines of yellow scales. (Middle America. )...quadrivittatus Coq. 
30. White band at the base of the second joint of the hind feet covering at least one- 
third of the length of the joint; claws of the hind feet toothed in the female. . 32 
White band covering less than one-fourth of the length of the second joint of the 
31. Seventh segment of the abdomen almost wholly yellow-scaled, many yellow 
scales in the central portion of the preceding segment; claws of the hind feet 
of: thestemale simple; 222622 foe eee ee eee aa eae cantator Coq. 
Seventh and preceding segments chiefly black-scaled; claws of the hind feet of 
(oversievanv Ke) hoo!) Neel ao eo oes Ses ood os sede casas seo re UNM ANIIS WINEG)0- 
32. Claspers of the male having, near the base of the inner side, a large process 
thicklyacoviered awrite a irs tee sere eee eer fitchii Felt. 
Claspers without such a process -.--.: subcantans Felt, abfitchii Felt, vittata Theob. 
(b) List oF THE SPECIES AND SYNONYMS. 
abfitchii Felt. _ bracteatus Coq. 
ae  cantator Coq. 
ne el e us C ; | canadensis Theob. 
rope 1s JOT. | . ° = 
ae oe % | | cinereoborealis F. & Y.@ 
aurifer Coq. trichurus Dyar. 
bimaculatus Coq. | 
«The writer’s copy of Science containing the original description of this species 
was received September 2, 1904, and the National Museum copy is stamped as having 
been received on the same date. The writer’s copy of the Journal of the New York 
Entomological Society which contains the original description of trichurus was 
received September 6, 1904; the National Museum copy and that of the U.S. 
Department of Agriculture are stamped with the same date—September 6, 1904. 
