AMERICAN HYMENOPTERA. SGI 



well known in England and is supposed to be imported in timber from 

 Canada. 



7. IT. abdominalis. 



Sircx abdominalis, Harris Catalogue, 1835. 



Urocerus abdominalis, Harris, Inj. Ins. 3d. Ed. 540, % . Fitch, Nox. Ins. iv, 

 ib, -laZ, % . 



Shining black, with a spot on each side of the head and a band on the 

 antenna;, and the abdomen yellow red. Length, 0.76 — 0.80. Br. wings 0.20 — 

 1.30 inch. 



S. — Shining black, tinged with blue; antennae 24 — 25-jointed, 

 ends black, the band in the middle yellow rufous, sometimes almost 

 black; an oval spot behind each eye, mouth below antennae, and a spot 

 on each corner of collar yellow red, (these two latter sometimes color 

 of body); the third, fourth, fifth and sixth segments of tergum yellow 

 rufous; legs blue black, tip of the four anterior femora and legs be- 

 neath, the base of posterior tibiae and first tarsal joint and the last joint 

 of tarsi reddish yellow; wings yellowish hyaline, sometimes clouded 

 with black, apex clouded, nervures yellowish, ci'oss-nervure of second 

 brachial wanting; cornus acute, not constricted, but as in males of 

 other bpecies. 



Massachusetts, (Harris Coll., Coll. Am. Eat. Soc); New York. 



Six specimens examined. It is difficult to decide whether this is 

 the male of U. albkorm's ov of U. Jlavicoj-iiis, hut it seems most likely to 

 belong to the first. Dr. Harris states that it is found in the trunks of 

 the white pine in July. 



8. TJ. Cressoni. 



Urocerus Cressoni, Korton, Proc. Ent. Soc. Phil, iii, 1864, 16, 34, 9. 



Black, antennfe partly white, spot back of eyes and apex of abdomen rufous, 

 base of hinder libise white. Length 0.64, with ovip. 0.86. Br. wings 1.24 inch. 

 5 . — Black; antenna3 20-jointed, the ten apical articles straw white, 

 the base of the eleventh and tips of the apical article brown; a rufous 

 spot (not defined at edges) back of each eye ; the six basal segments of 

 abdomen of a soft velvety violaceous brown ; remaining segments ru- 

 fous ; cornus compressed at base, lance shaped ; ovipositor not longer 

 than abdomen and cornus together; legs black, the base of posterior 

 tibice and of first joint of their tarsi white ; remaining joints blackish ; 

 all the claws red; wings obscure brownish violaceous, nervures piceous ; 

 cross nerviire of second brachial cell incomplete. (Penn.) 



Var. a. — 9 Antennae 21-jointed, the ten basal joints black, remain- 

 ing eleven white, tips of apical joints brown, basal plates yellowish, a 

 black spot at sides of basal segment and beneath, the base of four 

 hinder tibiae and tarsi yellowish ; wings violaceous. (Albany.) 



TRANS. AMER. ENT. SOC (47) JUNE, 1869. 



