THE CANADIAN ENTOMOLOGIST. 25 



Cyrtogaster, Walker, is a well-known European genus well represented 

 in our fauna, although now noticed for the first time, my collection con- 

 taining not less than seven undescribed species. Kirchner records eleven 

 described species in Europe. 



Sub-family TRVPHONiNiE. 



Tribe Mesoleptini. 

 Genus Gausocetitrus, Fcirster. 

 I. Gaiisocenirus gyrini, sp. n. 



$. — Length, 3.5 to 3.8 mm. Black, shining, impunctate, clothed 

 with a sparse, fine greyish pubescence, more apparent on face and 

 metapleura, the apex of second abdominal segment f)roadly margined 

 with red ; petiole and second segment towards base subopaque, the 

 former channeled, the latter feebly aciculated basally ; petiole very long, 

 rather slender and nearly as wide at base as at apex, about one-fourth 

 longer than the second segment ; third segment about two-thirds the 

 length of second ; fourth about half the length of third ; following seg- 

 ments a little shorter subequal. 



Head transverse, a little wider than the widest part of thorax, polished, 

 except the face, which is feebly rugulose ; clypeus subconvex, polished, 

 truncate at apex ; eyes larger, extending nearly to the base of mandibles ; 

 palpi pale or yellowish ; mandibles pale rufous, bi-dentate, the teeth 

 subequal ; antennte long, filiform, 20-jointed, reaching to base of second 

 abdominal segment, the scape and pedicel obscure rufous, stouter than 

 the flagellum and together not quite as long as the first flagellar joint, 

 the flagellum black, cylindrical, of a uniform thickness throughout, finely 

 pubescent, the joints gradually shortening toward apex. 



Thorax smooth, with two well-defined parapsidal furrows ; pronotum 

 contracted, much narrower than the mesonotum \ scutellum with a deep 

 transverse depression at base, behind which it is convexly elevated \ 

 metathorax areolated above, rounded off posteriorly, with the pleura 

 finally rugose ; tegulae and legs, including all coxee, brownish-yellow, or 

 pale ferruginous, the middle and hind tarsi and the posterior tibiae above, 

 subfuscous ; tibial spurs, i, 2, 2, not conspicuous; wings hyaline, the 

 large stigma and venation dark brown; areolet pentagonal ;. second dis- 

 coidal cell only about half the length of the third, the discoidal nervure 

 very obtusely angulate a little before the middle of the third discoidal cell. 



Hab. — Independence, Iowa. 



Bred by Mr. H. F. Wickham, from pupa of a water beetle, Gyriiius sp. 



