28, Psyche [April-June 



the micropterygids seem to lack these structures, this feature may 

 also be of value in distinguishing between the orders Lepidoptera 

 and Trichoptera. The styli labeled "s" in the larva shown in 

 Fig. 6 are apparently represented by the so-called gonopods, or 

 gonostyli "s" of the adult male Trichopteron shown in Fig. 15 

 (Plate III). Even when the gonopods "h" are well developed in 

 male Lepidoptera (Fig. 13), they apparently retain only one dis- 

 tinct segment "h," while in those Trichoptera in which the gono- 

 pods are exceptionally well developed, the gonostyle portion 

 labeled "s" in Fig. 15, usually consists of two distinct segments. 

 Furthermore, the dorsal lobes "sg" are of a different type in the 

 two groups of insects, and these features may be of some value in 

 further distinguishing between the Lepidoptera and Trichoptera. 



McLachlan, 1874-1880 (Monographic Revision of the Trichop- 

 tera) on page 206 states that '' Enoicyla is the only authenticated 

 example of terrestrial habits in the larvse of recent Trichoptera, 

 . The genus is scarcely less remarkable by its practically 

 apterous female. . . . The pupse . . . have very distinct 

 spiracles. . . . The larva lives vmder moss, etc., at the foot of 

 trees, chiefly in woods, and often at great distances from water." 

 Since some of the larvae of the micropterygoids feed on mosses 

 (Musci) and occur in somewhat similar locations, these facts lend 

 additional weight to the view that Trichoptera and Lepidoptera 

 are very closely related. 



In discussing the protocerebrum of Micropteryx, Buxton, 1917 

 (Trans. Ent. Soc. London, 1917-1918, p. 135) states that "In 

 Micropteryx paired ocelli are present, but the median ocellus is 

 not developed here, or in any other Lepidopteron or Trichopteron." 

 This is very probably true of the Lepidoptera as a whole, but I find 

 a median ocellus in many Trichoptera (see Fig. 11 of article on 

 head region of insects in Annals Ent. Soc. America, 1917, p. 339» 

 and Fig. 2 of the present paper). If no median ocellus occurs in 

 any Lepidopteron, and does occur in some Trichoptera, this may 

 be regarded another feature of some value in distinguishing between 

 the orders. 



Mr. Banks has called my attention to the fact that "scales" 

 occur on the wings of certain Trichoptera, and their presence is 

 therefore not diagnostic for the order Lepidoptera. Thus 

 McLachlan (1. c. p. 274) in describing the trichopterous genus 



