INSECUTOR INSCITI^ MENSTRUUS 75 



lobe is reduced to a small stem, bearing the two stout hairs, 

 while, in aiirifer, the structure is absent, hairs and all, there 

 being no basal lobe in this species, though the spine persists. 



Of the following North American species the male genitalia 

 are unknown : dccticus Howard, Dyar and Knab, centrotus 

 Howard, Dyar and Knab, cataphylla Dyar, fisheri Dyar, ventro- 

 vittis Dyar, provocans Walker, acrophilus Dyar, niphadopsis 

 Dyar and Knab, bracteatus Coquillett,^ balteatus Dyar and 

 Knab.^ angustiznttatus Dyar and Knab,^ obturbator Dyar and 

 Knab,^ condolescans Dyar and Knab,^ nubilus Theobald, goni- 

 miis Dyar and Knab, aloponotnin Dyar, and the imperfectly 

 identified names, fulvus Wiedemann, testaceus van der Wulp, 

 excrucians Walker, borealis Ludlow, and punctor Kirby. I 

 am afraid that euochrus Howard, Dyar and Knab is vexans in 

 a dilapidated condition, the yellow color of the single specimen 

 not being natural. 



Croup V. — Harpago well developed ; both lobes consisting 

 of flattened membranous papillose prominences with small 

 setae. 



The group comprises one species, canadensis, the larvae living 

 in ground pools in forest, having more than one hatching in 

 the year. 



In comparison with the table based on adult coloration, no 

 parallelism appears. The black-legged and ring-legged forms 

 are developed in all the groups. This has served to com- 

 pletely conceal the species of Old World derivation, which are 

 inextricably mixed up in the table. No one would ever suspect 

 their relationship, which is so apparent in the genitalia. 



Table of North American Aedes by the Male Genitalia 



1. Harpago developed, with filamentous seta and columnar base... 2 



Harpago rudimentary, a stout seta from a conical base 46 



Harpago absent 49 



New World series 



2. Side piece with an apical lobe 3 



Side piece without an apical lobe 38 



' Placed provisionally in the table, in parentheses. 



