128 HYMENOPTERA. 



Genus 3. PERDITA, n. g. 

 Perdita, F. Smith's MSS. (Details, Plate V.) 



Antennae inserted in the middle of the face, approximating at 

 their base; eyes lateral, elongate-ovate, ocelli placed in a tri- 

 angle on the vertex ; mandibles slightly bent and without teeth ; 

 the labrum produced angularly in front ; tongue elongate, twice 

 the length of the mentum (labial and maxillary palpi wanting) ; 

 superior wings having one short marginal cell rounded on its in- 

 ferior margin, and broadly truncate at the apex, the first sub- 

 marginal cell more than twice the length of the second. 



1. PERDITA HALICTOIDES. 



Female. Length 2 lines. Head and thorax above nigro- 

 asneous, shining; the antennae at their extreme base and the 

 flagellum beneath pale testaceous ; the clypeus much produced 

 and having a few scattered punctures ; mandibles pale rufo-tes- 

 taceous, ferruginous at their tips; the metathorax of a blue- 

 green, disk of the thorax somewhat brassy, the former smooth, 

 truncated behind ; tegulae and extreme base of the wings pale 

 testaceous; wings hyaline, their nervures fuscous; legs rufo- 

 testaceous, the tarsi pale. Abdomen dark testaceous, the apex 

 covered with cinereous pubescence. 

 Hob. N. America. (Coll. F. Smith.) 



Genus 4. CALLIOPSIS. 



Calliopsis, F. Smith's MSS. (Details, Plate V.) 



Head as wide as the thorax, ocelli placed in a triangle on the 

 vertex ; the labium about equal in length to the mentum, 

 long and slender towards the apex, which is pubescent; the 

 first joint of the labial palpi, which are four-jointed, longer 

 than the three following; the maxillary palpi six-jointed; the 

 labrum rounded in front ; the anterior wings having one mar- 

 ginal cell, rounded at its apex, two submarginal cells, the first 

 rather longer than the second, which is narrowed towards the 

 marginal cell. 



1. CALLIOPSIS ANDRENIFORMIS. B.M. 



Female. Length 3 lines. Black, a line down the centre of 

 the clypeus united to a half-circular spot between the antennas, 

 and an oblong macula on each side of the face touching the 

 eyes, yellow; the flagellum beneath beyond the fourth joint 



