196 MOSQUITOES OF NORTH AMERICA 



4. Mouth-brushes normal 5 



Mouth-brushes of lamellate prehensile plates 



Megarhinus Robineau-Desvoidy (iv, p. 927) 



5. Air-tube with the outer half attenuated Mansonia Blanchard (iii, p. 501) 



Air-tube cylindrical or fusiform 6 



6. Antennae large, dilated Aedeomyia Theobald (iv, p. 893) 



Antenna small, slender Orthopodomyia Theobald (iv, p. 877) 



7. Air-tube with but a single pair of ventral tufts 8 



Air-tube with several pairs of ventral tufts 12 



8. Head elongate elliptical Vranotoenia Lynch Arribalzaga (iv, p. 898) 



Head nearly circular or transverse 9 



9. Air-tube pecten produced into long hairs; hair tuft close to base 



Culiseta Felt (iii, p. 474) 

 Air-tube pecten of short scales or if produced the hair tuft remote from base. 10 



10. Mandible angularly projecting laterally .. {ggrSi?nar,'f.l,"^!'&)''' 

 Mandible concealed 11 



11. Anal segment ringed by plate, with ventral hair-tufts piercing the ring 



Psorophora Robineau-Desvoidy (iv, p. 525) 

 Anal segment not ringed, or if so with the hair-tufts posterior to the ring 



C Aedes Meigen (iv, p. 607) 

 \H(Emagogus Williston (iv, p. 863) 



12. Mouth-brushes prehensile hooked lamellae Lutzia Theobald (iii, p. 466) 



Mouth-brushes normal 13 



13. Air-tube with moderately long or few hair-tufts outwardly 



Culex Linnaeus (iii, p. 215) 

 Air-tube with a ventral row of very closely placed hair-tufts 



Carrollia Lutz (iii, p. 461) 



The genus Dinanamesus Dyar & Knab is not included, the larvge being un- 

 known. 



Group DEINOCERITINES. 

 Genus DINOMIMETES Knab. 



Dinomimetes Knab, Journ. N. Y. Ent. Soc, xv, 120, 1907. 

 Dinomimetes Theobald, Mon. Culic, v, 553, 1910. 



The type species of Dinomimetes Knab is Dinomimetes epitedeus Knab. 

 Generic Diagnosis of Adult: 



Palpi short in both sexes, three-jointed, the last joint longer than the two pre- 

 ceding. Antennae long and slender, similar in the sexes, longer in the male, whorls 

 at bases of joints short, hardly differentiated from the scattered hairs on the shaft; 

 second joint about sixteen times as long as wide, slightly shorter in the female; third 

 joint slightly shorter and more slender than the second in the male, about five-sixths 

 as long in the female; succeeding joints gradually diminishing in length in the male, 

 the fourth and fifth long in the female, the others considerably shorter. Prothoracic 

 lobes remote dorsally. Mesonotum with longitudinal rows of coarse setae. Post- 

 notum usually with two minute bristles inserted mesially near the posterior margin, 

 varying in number, possibly rarely absent. Abdomen compressed, truncate at tip in 

 the female, the cerci stout, conical; abdomen of the male subcylindrical, somewhat 

 expanded at tip, with stout claspers. Legs long and slender; all the claws simple 

 in the female, one claw with basal lateral tooth on the front and middle legs in the 

 male. 



Geneeic Diagnosis of Larva : 



Structurally identical with that of Deinocerites. 



East coast of Costa Eica to Panama. 



The genus Dinomimetes was originally supposed to be a sabethine on account 

 of the presence of setse upon the postnotum, but we now recognize it to belong 

 to the deinoceritines. The setse on the postnotum appear to be in a somewhat 

 unstable condition, and we have some specimens in which they appear to be absent. 

 These setse are stouter and fewer in number than in any sabcthines known to us, 

 and, although similarly located, it appears that they are not homologues with 

 those. We retain the genus on the character of the presence of these setae, al- 

 though recognizing that it is a rather weak one. The antennae of the female, 

 being similarly modified to those of the male in regard to the proportionate 



