26 E. T. CRE8S0N. 



liOpIiyras melliceps. — 9. — Black, shining; head, prothorax and an- 

 terior lobe of niesoliiorax, honey-yellow; a black curved line on vertex just 

 above antennae, covering the ocelli; mandibles brown; antennae short, about 

 fourteen-jointed, entirely black; wings hyaline, iridescent, nervures brown, 

 lanceolate cell contracted in middle; legs luteous, four posterior coxse except 

 tips, and tarsi fuscous: extreme apex of abdomen and broad line on sides, 

 luteous. Length .30 inch. 



Hah. — Massachusetts, (Henshaw). This belongs to the subgenus 

 Monocteniis Dahlb. 



liOphyrus sufTusns. — ?. — Luteous yellow, shining, head and thorax 

 tinged with fulvous; a semicircular line on vertex covering ocelli, tips of 

 mandibles, antennae, stripe on each lateral lobe of mesothorax, lateral scutel- 

 lar region, tip of scutellum, metathorax, posterior portion of pectus, anterior 

 margin of basal plates, sides more or less of three or four basal segments of 

 abdomen, and most of venter, black; antennae short, serrate, fifteen-jointed; 

 mesothorax and scutellum smooth and polished; wings hyaline, nervures and 

 stigma black or fuscous, dividing nervure between first and second submar- 

 ginal cells hyaline, lanceolate cell contracted in middle; tips of tarsi fuscous. 

 Length .30 inch. 



Hah. — Massachusetts. Belongs to the subgenus Monoctenus Dahlb. 



L.YDA Fabr. 



Ijyda discolor. — 9- — Ochraceous, varied with pale brown; head behind 

 ocelli more or less pale brown, with the usual pale spots and lines, generally 

 indistinctly defined, spots enclosing the two posterior ocelli, and short line 

 leading from anterior ocellus to base of antennae, sometimes obsolete, black; 

 antennae slender, about thirty-four-jointed, scape black above, apical joints 

 more or less dusky, third joint more than twice the length of the fourth; side 

 lobes of mesothorax more or less pale brown; anterior margin of middle lobe 

 of mesothorax black, as well as depression on sides of scutellum; base of post- 

 Bcutellum, spot on sides of metathorax above and basal margin of basal plates; 

 thorax beneath pale ochraceous or luteous, the pectus more or less pale brown; 

 wings hyaline, sometimes tinged with yellow, nervures and stigma luteous, 

 second branchial cell without cross-nervure; legs dull honey-yellow, anterior 

 tibiae with oae side spur; abdomen more or less tinged with pale brown above. 

 Length .50 inch. 



Hah. — Canada, Pennsylvania, Nevada. 



L>yda verticalis. — 9- — Fuaco-ferruginous, shining; palpi pale; a large 

 irregular, transverse mark on vertex extending nearly to eyes, space between 

 antennae, basal margin of clypeus, scape, extreme apex of antennae, spot on 

 disk of mesothorax, one on each side lobe over tegulae, anterior margin, meta- 

 thorax, pleura posteriorly, pectus, all the coxae and base of femora more or 

 less, black; antennae slender, about thirty-six-jointed, third joint about twice 

 the length of fourth ; wings subhyaline, with a golden gloss, and subviolaceous 

 tips, third submarginal cell not longer than second, second branchial cell with- 

 out cross-nervure; anterior tibiae with one side spur; ventral segments more 

 or less broadly black at base. Length .45 inch. 

 Hah. — California, (H. Edwards). 



