NATURAL SCIENCES OP PHILADELPHIA. 361 



List of the PSEUDONEUROPTERA of Illinois contained in the Cabinet of the 

 writer, with descriptions of over forty new species, and notes on their struc- 

 tural affinities. 



BY BENJAMIN D. WALSH, M. A. 



[N. B. Except where otherwise stated, the following species have been taken 

 by myself within four miles of the city of Rock Island. None of my specimens 

 are alcoholic. The species with an exclamation point (!) affixed have been 

 kindly identified by Dr. Hagen, the author of the Smithsonian Synopsis of 

 American Neuroptera, from duplicates which I sent him in 1860 ; but to prevent 

 possible mistakes I have compared most of them with his diagnoses.] 



TERMITINA. 



Termes flavipes, Kollar, South Illinois. 



PSOCINA. 



\\ " Tarsi two-articulate, discoidal cell closed, quadrangular." (Psocus, Sub- 

 genus C, Hagen.) 



Psocus venosus, Burm. ! P. contaminatus, Hagen ! (South Illinois.) P. 

 Nov,*: scotl/E, Walker ! P. lichenatus, Uhler (auctore ipso). This last species 

 is not included in Dr. Hagen's synopsis. 



Psocus purus, new species. Head cinereous, with a large fuscous spot on 

 the posterior nasus, a small round one on the ocelli, and two on the occiput, 

 which are sometimes almost obsolete ; antennae black, with three basal joints 

 whitish. Thorax and abdomen black, with the sutures whitish. Legs whitish; 

 knees and tarsi a little fuscous. Wings hyaline, except a small black spot on 

 the middle of the posterior margin; veins black, except the posterior side of 

 the discoidal cellule and basal half of 1st sector, which are white ; pterostigma 

 triangular, hyaline, with a small fuscous spot at its basal angle ; its nervures 

 black, except the basal half of the inner nervure, which is conspicuously white ; 

 posterior wings hyaline, with violet reflections. 



Length to the tip of wings 6J millimetres. Expanse of anterior wings 12 

 mill. Described from three specimens. 



Psocus semistriatus, n. sp. Head yellowish cinereous ; nasus sometimes 

 conspicuously, sometimes obscurely, lineated with black ; in one specimen en- 

 tirely black ; a small black spot on the ocelli ; eyes <$ globose, prominent ; 

 antennae fuscous, two basal articulations, and sometimes part of the third, 

 pale; antennae $ with the seta hairy. Thorax and abdomen black, with the 

 sutures whitish. Legs pale, with the tarsi, and sometimes the tips of the tibiae 

 and the femora, a little fuscous. Wings entirely hyaline, except a small fus- 

 cous spot on the middle of the posterior margin; veins black; pterostigma 

 triangular, rounded behind, more or less fuscous, sometimes almost black, 

 always with the basal angle paler ; posterior wings hyaline, with green 

 reflections. 



Length to tip of wings 4 5 mill. Expanse of anterior wings 7 9 mill. 

 Described from eighteen specimens. 



Psocus perplexus, n. sp. 9 Differs from the above in size, in the greater 

 proportioual length of the antennae, which extend beyond the wings, in the 

 ocelli being much wider apart and not connected by any black spot, and in the 

 pterostigma being of uniform fuscous color and proportionally longer and not 

 rounded behind. 



Expanse of anterior wings 11 mill. One 9 specimen. Theoiscal bifurcation 

 of the anterior wing is peduncled, but this is occasionally seen in semistriatus 

 mini. 



Psocus pollutus, n. sp. Head yellowish cinereous ; front with a round discal 



1862.] 



