66 EDWARD NORTON. 



6. H. clavicornis. 



Tenthredo clavicornis, Fab., Ent. Syst. II, 1793, 108, 14. 



Sylotoma clavicornis, Fab., Syst. Piez. 24, 12. 



Lepel., Mon. Tenth. 45, 125. 

 Head, thorax and base of legs blue-black; antennse, abdomen, except tip, and 

 legs yellowish; wings hyaline, with a spot below stigma. Length 0.36. Br. 

 wings 0.74 inch. 



9 . AnteniiEe yellowish, their first, second and base of third joint 

 blackish; head and thorax bliie-black, polished, with fine, sparse hair; 

 labrum and mandibles ferrugiaous ; palpi paler ; abdomen yellowish, 

 with the anal segments beneath black; legs above the knees blue-black; 

 apical third of anterior femora before, tips of the four posterior femora 

 ;ind all the tibife and tarsi yellowish ; apical tarsi fuscous. Wings hy- 

 aline, basal half slightly smoky ; a fuscous semi-cylindrical spot below 

 the stigma, (the flattened side toward the apex); second recurrent ner- 

 vure received near the base of third submarginal cell. 



Var. a. Abdomen entirely of one color. (White Mountains). 



Var. b. Tergum in middle of segments and at base steel-blue; about 

 the sutures ferruginous. (White Mountains). 



Var. c. Head and thorax greenish-black. Tergum with blackish 

 bands in middle. Legs wholly yellowish. ( S 9 Albany, N. Y.) 



New England. English lliver, (Smithsonian Institute). New York, 

 (Dr. Peck). 



Only one, of many specimens examined, has the apical segments 

 black above. Some have fuscous or black irregular spots on dift'erent 

 parts of the abdomen. 



6. H. abdominalis. 



Hylotoma abdominalis. Leach, Zool. Misc. Ill, 1817, 123, 9 • 

 Lepel., Mon. Tenth. 45, 124, 9. 

 Length 4 — 6 lines. Br. wing^i 8 — 10 lines. 



"9. Antennte black ; head and thorax blue-black; abdomen deep 

 yellow; legs blue-black; tibiiB black; wings fuscous." 



Georgia. 



A male from Maine (Cambr. Mus.) resembles this. Wings tinged 

 with violaceous ; abdomen reddish-yellow. One of the wings is per- 

 fect; in the other the third submarginal cell has a supplementary cross- 

 line, making five cells. The discoidal cell beneath it has also another 

 cross-nervure, making four discoidal cells. 



A single female from Connecticut differs only in having the apical 

 half of wings hyaline, basal half fuscous, (not yellowish,) and a cylin- 

 drical darker spot beneath the stigma as in H. McLeayl. The anten- 

 nas are short as in that; the face covered with rather long whitish hair; 



