OF NATURAL HISTORY. 711 



Body rutbu.s, tin-eJ with yoUuwLsh : head bhick on the vi-rtt-x : 

 antennae blackish, excepting' the two or tliroc basal jointM ; about 

 as loiii; as tlie body : mandibles black at tiji : thorax sonu-what 

 trilol>ate, black, with an obsolete ruibus central spot: seutel 

 black : wings hyaline; ncrvures and robust carpus black ; second 

 cubital cellule confluent with the third ; inferior discoidal cellule 

 half as large as the central one : posterior tibi;c dusky except at 

 base : coxaj yellowish : abdomen oblong subovate, short, dusky 

 at tip; densely punctured, with three segments, deorcasiuLT in 

 length ; a small, almost concealed terminal segment. 



Length -^ one-fifth of an inch. [260] 



The cubital cellules are but twi», the second transverse nervur*; 

 being entirely wanting, and the nervure forming the anal side of 

 the cubital cellules is very slender ; the other ncrvures being 

 quite robust. If the genera throughout this order, are not tt> be 

 divided as in the Tinthmlinrtit, 1 would propose the se|taration 

 of this and the following species, under the generic name of 

 Aliolus. 



The character of the abdomen agrees with this genus; but the 

 ncuration of the wings seems to agree rather better with Mii r<i- 

 ijashr. 



2U. B. THOR.YCICUS. — Black; thorax and feet honey-yellow. 



Inhabits Indiana. 



5 Head : thorax honey-yellow, with two obli(|Uc 



lineated grooves; suture before the scutel much dilated and pro- 

 found : wings hyaline ; radial ctUulc with the ncrvures as dis- 

 tinct as the others, regularly arcuated, without any angulation ; 

 second cubital cellule much dilated and destitute of the exterior 

 nervure : metathorax black : abdomen minutely jjunctured or 

 lineated at base, i)olished towards the tip, oval ; second incisure 

 indistinct : oviduct longer than the abdomen : feet honey-yellow. 



Length less than one-tenth of an inch. 



MICrvOliASTHll Latr. 



1. M. ENSIfiKR. — Black; feet and each side of the base of tho 

 abdomen yellowish. 



Inhabits Indiana. 



9 Body black, with ililated punctures and minute hairs : mouth 

 honey-yellow: palpi white: thorax with a yellow wing-scale; 

 1835.] 



