176 ENTOMOLOGICAL SOCIETY 



Discoidal nervure not interstitial with the median nervure, issuing from 

 the transverse median nervure; $ antennae i3-jointed (9 unknown). 



Peras Westw. 

 LIOPTERON PERTY. 



1833. Delect, anim. artic. Brasil, p. 140. 



1837. Westwood, in Guer. Mag. and Zool., No. 179. 



1874. Thes. Ent. Oxon., p. 132. 



(Type L. compressum Pert} 7 -.) 



The following table will assist in determining the species 

 known at present : 



Table of Species. 



Body mostly rufous, the abdomen sometimes black 4. 



Head and thorax black, abdomen rufous . , 3. 



Body black. 



Wings black, tinged with purple L. nigripenne Westw. 



Wings dusky, the submarginal cell nigro-fuscous...L. compressum Perty. 

 Wings hyaline or subhyaline, sometimes maculate or fasciate. 



Legs rufous 2. 



Legs black. 



Scutellum truncate posteriorly and sinuate medially, the angles 

 subtuberculate. 



Anterior wings with a transverse fascia just beyond apex of 



marginal cell and extending to middle of wing; petiole of 



abdomen about 4 times as long as thick. ..L. clavicorne Westw. 



Anterior wings with the extreme base, apex, and the submarginal 



cell dusky, no fascia ; petiole of abdomen about 4^ times as 



long as thick L. fuscicorne Westw. 



Scutellum posteriorly subtruncate, not sinuate medially. 



Anterior wings nearly hyaline, their apex faintly but somewhat 

 broadly dusky; petiole about 2$ times as long as thick. 



L. subpetiolatum Westw. 



Wings hyaline, with the base and apex dusky, venation in middle of 

 wings yellowish ; scutellum bituberculate at apex. 



L. apicale Westw. 

 Wings subfuscous, maculate with hyaline. 



Scutellum truncate posteriorly and slightly sinuate medially; legs 

 entirely black; petiole about 5 times as long as thick; antennae 

 14-jointed, as long as the body, much incrassated toward apex. fa 



L. fenestratum sp. n. 



Wings fuscous, with apical one-third and a band extending through 

 the basal half of marginal cell to nearly the hind margin, hyaline; 

 legs black, but with the anterior and middle tarsi piceous-brown ; 

 scutellum subbidentate posteriorly; body of abdomen not long, 

 obtuse or truncate at apex, the petiole about 4 times as long as 

 thick : L. tarsale sp. n. 



