178 Journal New York Entomological Society, [vol. xiv. 



Subfamily CULICIN^. 

 Table of genera. 



1. Mouth brush prehensile, folded outward in a pencil 2 



Mouth brush vibratile, diffusely folded inward 4 



2. A lateral plate on the eighth abdominal segment Megarhinus 



A lateral patch of scales on the eighth abdominal segment 3 



3. Scales of the 8th segment in a line preceded by a patch of minute ones. 



Psorophora 

 Scales a'ike, in a triangular patch without small ones Lutzia 



4. Air tube long, the hairs in scattered tufts or absent, the antennae 



usually with the tuft beyond the middle arising from a notch 5 



Air tube short, less than four times as long as w T ide, or if longer 



the antennae with the tuft at or before the middle 7 



5 Anal segment without hairs before the barred area 6 



Anal segment with hairs along ventral line, piercing the chitinous band 



Culicclla 



6. Lateral comb of the 8th segment of many scales in a triangular patch Culex 

 Lateral comb of the 8th segment a single row of bar-like spines Mochlostyrax 



7. Air tube strongly inflated Janthinosoma 



Air tube not conspicuously inflated 8 



8. Antennae strongly inflated and distorted Ceratocystia 



Antennae not so 9 



i). Head normal, without lateral angular projection 10 



Head with lateral projection covering a process on the mandible. ..... 



Dc in oce rites 



10. Head with large thick spinous setae Uranotcenia 



Head with normal fine hairs 11 



11. Seventh abdominal segment with a dorsal plate; tube without pecten 



Mansonia 

 Abdomen without plates; air tube with pecten 12 



12. Air tube conical or tapered, normal 13 



Air tube bottle-shaped, the outer half narrow Tceniorhynchus 



13. Air tube pecten produced into long hairs Culiseta 



Air tube with the pecten not so produced Aedes 



Genus MEGARHINUS Desvoidy. 



Megarhinus Desvoidy, Mem. soc. d'hist. nat. Paris, iii, 412, 1827. 

 Megarhinus Blanchard, Les Moustiques, 220, 1905. 



Table of species. 



1. Large species, the chitinized parts very dark portoricensis 



Smaller species, the chitinized parts very pale violaceus 



Megarhinus portoricensis von Roder. 



Megarhina portoricensis von Roder, Stett. ent. Zeit., xlvi, 337, 1885. 

 Megarhinus rutila Coquillett, Can. ent., xxviii, 44, 1896. 



