BAGWORM MOTHS OF THE WESTERN HEMISPHERE 29 



either for short distance or for entire length. Secondaries usually 

 with Sc+Ri and Rs parallel to wing apex, occasionally with basal 

 crossvein and/or with outer one near apex of discal cell; lA fre- 

 quently disappearing, 2A and 3A present. 



Male genitalia. — Uncus absent. Tegumen usually hood-shaped, 

 often cleft at apex. Valves typically short and broad; pul villus at 

 base of valve becoming prominent in higher forms; apex of sacculus 

 usually distinctly set off from rest of valve. Saccus poorly developed 

 in primitive psychids, but tending toward gi'eat elongation in more 

 advanced genera. 



Female.— Similar to males m most generalized forms with gradual 

 reduction of all external structures (fig. 144) in higher groups. Anten- 

 nae, if present, usually simple. Abdomen with dense tuft of long 

 hair concentrated on seventh segment. 



Female genitalia. — Ovipositor in lower forms greatly extended, 

 with usually three pau's of elongate apodemes; extremely reduced 

 in more specialized genera, with apodemes sometimes lost. Internal 

 genitalia relatively simple in lower groups with bm'sa copulatrix 

 reduced in size; ductus seminalis short, usually not exceeding bursa 

 in length. In higher forms, internal genitalia become more modified, 

 probably in accordance with increased egg capacity ; bursa may greatly 

 exceed size of spermatheca, and seminal duct may become very 

 lengthened and convoluted (as in Oikeiicus). 



Key to Genera Based on Characters of Adult Male 



One species, Apterona crenulella form helix, that has been introduced 

 recently into the United States at present is not known in this country 

 from the adult male. Thus, parthenogenetic female specimens 

 collected within the geographical scope of this treatment cannot be 

 determined on the basis of the key presented below. Since it was 

 not possible to devise comprehensive keys for the females or immature 

 stages, suffice it to say here that the coiled larval case of this species 

 (fig. 69) is unique among our New World psychids; the known cases 

 of the other included species are straight and elongate. In case a 

 male specimen should be found within our area, this form has been 

 included in the following key. 



la. Foretibia with epiphysis present. 

 2a. Hindtibia with four prominent spurs. 



3a. Antennae broadly bipectinate; hiudwing with 7 veins; epiphysis basad 



and as long as foretibia or nearly so 2. Fumaria casta 



3b. Antennae simple and ciliate; hiudwing with 6 veins; epiphysis subapical 

 and approximately one-third length of foretibia. 



1. Solenobia walshclla 



