THE FEATIII:K-\V1.\(;KI) IJKKTFiES. 485 



rdiiiidcd. widely scpiii'iilcil liy the hroiidly dihitcd second Nciiti'id 

 seffiiient; tarsi three-,i(>inte(|. 



Several sj)e('ies oF llie iieims Mi(rop( plus have a raiiye which 

 may ineliid(> Indiana. 'I'liey iiaxc (lie ahdonieii iiiar<,niied and liead, 

 thorax and elytra costale. nnicli as in (II iijiIohki. M. <rih<iliis Lee, 

 lilaekisli willi tlie next Id last seii-ment «d" nhdimien cjirinalc above; 

 llie ('(ishe 111' elyli-;i sinnale. iiiler\;ds cdjirsely pnnclnred, len<i"lli 2 

 noil., has heen taken ne;n- ( 'inciiinal i. .1/. t< sscnda Curtis, sixth 

 se<;'iiienl not cai'inale. hody hhick. sliiiiini!'. length l.o 1* nun., is a 

 Ixn'cal species known from Michigan. 



Family XII. TIJ !(' IK >l"ri:KV( i 11 ).!-;. 



Till': Ki;\'riii;i;-wi.\(;i:i) Ui;i':'riA';s. 



This is a small Family oF miniile heetles. the lai'gest ol" which 

 scjii'cely exi-eeds a piiidiead in size. They lixc in rollen wood and 

 dnnu'. on fungus covered lous and in anis" nests, and comprise the 

 smallest oF known, heetles. The name is derived from thai of tlu; 

 typical genus, TrichopUrjix, a term meaning "hairy-winged," the 

 inner wings, when present, heing long, narrow and fringed with 

 long haii's, or feather-like in appearance. 



The members of the family have the maxilke exposed at the base, 

 which is large, with two lobes, the outer one hooked; palpi 4-jointed, 

 the last joint needle-shaped; antenna? usually ll-jointed, inserted 

 on the margins of the front, the .joints with whorls of long hairs, 

 joints -l to 7 slender. 8-11 thicker, forming a loose elongate club; 

 thorax with the side pieces distinct; elytra often abbreviated; inner 

 wings as al)ove descivibed; abdomen with six or seven free ventral 

 segments; front coxa; subglobular. ]n'oininent, contiguous; middle 

 coxae oval, separated; hind ones trans\'erse, more or less separated; 

 tarsi 3-jointed, the last joint with two equal simple claws. 



About 75 species, disti'il)uted among 18 genera, are known from 

 North America. Of these hut S have heen taken in Indiana, though 

 a number of others doubtless occur, and the genera are therefore 

 included in the key which Foilows: The lU'incipal and pi-actically 

 the only reference works are as follows: 



Matthncfi, Rev. A. — "Trichop1er>gia Illust.rata et Descripta." 



Tiondon, 1872. 

 Ihid. "Synopsis n\' .\orl li .\meri(;in Triehopteryuidu'," in 



Trans. Amer. l^nt. Soc. XI, 1884, 1 13-156. 



