36 INSECUTOR INSClTlyE MljNSTRUUS 



Type, male, No. 23939, U. S. Nat. Mus.; Orotina, Costa 

 Rica, elevation 300 meters, October 17, 1920 (A. Alfaro). 



Aedes (Culiselsa^) perichares, new species. 



Female. Head with narrow curved white scales on the 

 vertex, succeeded by flat white ones, which reach the eye- 

 margin, flat black ones below ; bristles long ; a few erect forked 

 black scales on the nape. Tori nude, clypeus nude, a patch of 

 white scales on first joint of antenna. Mesonotum with dense 

 dark brown narrow curved scales, white along the anterior 

 margin, cut by two black impressed lines, continued laterally, 

 and curved inward as in Aedes aegypti, except that the mark- 

 ing is diffuse and of a grayish silvery ; white scales about 

 antescutellar space and on scutellum. Abdomen black, with 

 narrow lateral basal segmental white patches ; venter with the 

 segments white at base, black on the apical halves. Legs 

 black, the femora narrowly whitish beneath at base ; tarsi with 

 narrow white rings at both ends of the joints, broader on the 

 hind legs, the last hind tarsal all white. Wing-scales black, 

 narrow and hair-like. Claws toothed. 



Male hypopygium. Side pieces long and slender, conical, 

 coarsely hairy, especially within ; no apical lobe ; basal lobe 

 small, with many long setae. Clasper with long blunt-ended 

 spine. Claspette rather long, with a long seta just before its 

 tip ; filament slender and pointed, about as long as the stem. 

 Tenth sternites long, slender, slightly hooked at tip. Aedoeagus 

 conical, large. Ninth tergites undeveloped. 



Described from nine males and five females, No. 23972, 

 U. S. Nat. Mus. ; Ciruelas, Costa Rica, elevation 800 meters, 

 October 29, 1920, from larvae in stone holes (A. Alfaro). 



Nearest to fluviatilis Lutz, but the white tarsal rings on both 

 ends of the joints. 



• To replace Taeniorhynchus as used by me, following the monograph, to avoid 

 the confusion caused by the use of Taeniorhynchus in the sensa of Mansonia, as 

 employed by Theobald, Edwards and others. 



