AMERICAN HYMENOPTERA. 29 



I^yda rufiventris. — % . — Black, shining; sides of face,clypeu3, labrura, 

 posterior orbits, dot at summit of eyes, mandibles except tips, palpi and scape 

 beneath, yellow ; antennae slender, about thirty-six-jointed, third joint nearl v 

 three times longer than fourth, basal joints of flagellum fulvous; a pale dot 

 beneath tegulse; wings fusco-hyaline, nervures black, second branchial cell 

 with rudiment of cross-nervure; legs dull honey-yellow, coxoe, trochanters 

 and femora beneath black; anterior tibise each with one side spur; abdomen 

 ferruginous, extreme base black. Length .40 inch. 



% var. — Wings hyaline, basal joints of flagellum and femora black. 



Hab. — Nevada, (Morrison). 



Liyda bucepliala. — %. — Black, shining; head unusually large, broad, 

 strongly punctured; clypeus, face as high up as lower ocellus, anterior orbits, 

 cheeks entirely, extending back to occiput, mandibles except tips, palpi, basal 

 joint of antennae, pleura entirely except narrow space beneath base of wings, 

 sides of prothorax and beneath, two dots on anterior lobe of mesothorax 

 posteriorly, four anterior coxse beneath, and all the trochanters and femora 

 beneath, luteous; antennae about twenty-eight-jointed, slender, third joint 

 more than twice the length of the fourth, flagellum pale ferruginous, becom- 

 ing dusky at tip; wings hyaline, faintly dusky on apical half, nervures and 

 stigma fuscous, second branchial cell without cross-line; anterior tibiae with 

 one side spur; tibiae, tarsi and abdomen, except basal plates, fulvous. Length 

 .35 inch. 



Hab. — California, (H. Edwards). 



L<yda terniinalis. — 9 .^Black, shining; dot at summit of eyes, spot on 

 each side of vertex above ocelli and short line on sides of occiput, dull whitish ; 

 antennae slender, about thirty-six-jointed, third joint nearly three times longer 

 than fourth; wings hyaline, dusky at tips, nervures black, second branchial 

 cell without cross-nervure; anterior tibiae each with one side spur; the fourth 

 and following segments of abdomen ferruginous. Length .70 inch. 



Hab. — Nevada, (Morrison). 



lijda briinniceps. — 9 • — Black, shining ; head, two ill defined spots on 

 mesothorax posteriorly, scutellum and four anterior tibiae, yellowish-brown; 

 spot covering ocelli, spot at insertion of each antenna, tips of mandibles and 

 the palpi black; antennae slender, second joint fulvous, third more than twice 

 longer than fourth, (joints beyond the twelfth wanting); wings dusky, paler 

 at base, nervures black, second branchial cell without cross-nervure; anterior 

 tibiae with one side spur; lateral edges of abdomen very narrowly pale, more 

 or less interrupted. Length .50 inch. 



Hab. — White Mountains, N. H., (Morrison). 



L<yda marginiventris. — 9* — Black, shining; two nearly confluent 

 spots above antennae, spot at summit of eyes, continued by a narrow line to 

 transverse line on occiput, two ovate spots on vertex behind ocelli, broad line 

 on cheeks confluent with the line on occiput, clypeus, base of mandibles, upper 

 lateral margins of the prothorax, spot on each side beneath, a sublunate spot 

 on mesothorax in front, the scutellum, and spot above posterior coxae, whitish ; 

 antennae short, slender, about twenty-eight-jointed, third joint nearly three 

 times the length of the fourth ; wings hyaline, nervures black, second branchial 



