INSECUTOR INSCITI^ MENSTRUUS 116 



postponed a consideration of this group to the last of our 

 mosquitoes on account of the difficuhy of the subject and the 

 scarcity of material. The material has continued scarce, and 

 it is not probable that the species will ever be represented by 

 large series even when searched for, as their restricted habits 

 prevent them from becoming abundant. On this account many 

 species are represented only by females, which has rendered 

 the following study far from complete. ^ Only the main out- 

 lines can be discussed, but these are of interest. 



Breaking away entirely from the adult characters com- 

 monly in use, we find that the group divides into a number of 

 well-defined genera. I treat them here as such, although the 

 absence of female characters may not allow all of them to be 

 subsequently recognized. The specialization affects in general 

 the clasp filament, the basal structures remaining simple. In 

 one branch, the side-pieces have undergone modification. The 

 following table will be self-explanatory. The characters of 

 the new genera are given here and are not repeated under the 

 separate headings. 



TABLE OF GENERA 



1. Clasp filament apical on side-piece 2 



Clasp filament not apical, reduced, the angle of the side-piece 



more or less produced 13 



2. Clasp filament widened at tip and lobed 3 



Clasp filament widened at tip, slightly notched, but not lobed 



Menolepis Lutz 

 Clasp filament simple, with pointed tip Dodecamyia Dyar 



3. Clasp with the lobes well developed 4 



Clasp with the lobes reduced 12 



4. Clasp with four lobes, usually much complicated 5 



Clasp with three lobes, not excessively complicated 8 



Clasp with two lobes, articulated and opposed. .Limatus Theobald 



5. Harpes with projecting appendages Miomyia Dyar 



Harpes distorted; unci inflated and lobed DinomyiaTyyAr 



Harpes and unci simple, normal 6 



6. Clasp-stem shorter than the greatly expanded lobes 7 



Clasp-stem long and slender, lobes small HeliconiamyiaT>y2iT 



'Actually of 97 species here recognized, only 45 are known to me in 

 the male. 



