NORTH AMERICAN HYM ENOI’TERA. 
145 
13. Try po.Ny Ion riifozoiialis n. sp. PI. iii, fig. 3. 
9 .- Black, shining; front strongly and rngosely punctured, strongly im- 
pressed medially, with a short longitudinal carina above theantennse; clypens 
fine punctured, roundly emarginate mediall.v, slightly carinated anteriorly; 
vertex depressed medially; space between the eyes at vertex and beneath, equal 
to the length of the second and third antennal joints united ; head and thorax 
in the usual places with silvery pubescence. Thorax finely punctured ; dorsulum 
with a strong, short, impre.ssed line on each side; postscutellum slightly im- 
pressed medially ; metathorax above with an enclosed space, wdiich is transversely 
and obliquely striated, the posterior face rugose, strongly channeled medially; 
legs black, the posterior tarsi whitish medially ; wings hyaline, apical margin 
fuscous, the nervures bi-ownish ; first segmentof abdomen about one-third longer 
than the second, the latter strongly raised at base; first segment black, reddish 
along the sides, the second segment entirely reddish, the rest of the abdomen 
black, the third segment has a reddish spot on the sides. Length .55 inch. 
"J, . — First joint of flagellum more than twice the length of the following 
joint, the apical joint as long as the three preceding ones united ; clypeus more 
broadly emarginate than in the 9 - not carinated; posterior trochanters armed 
with a spine, the posterior tarsi whitish, except at base and apex ; first segment 
of abdomen more than one-third longer than the following one, which is not 
raised at base. Length .55 inch. 
Occurs ill Colorado. 
14. Trypo-xyloii arizoiieiise n. sp. PI. iii, fig. 13. 
9 . — Front strongly punctured, medially impressed, with a short longitudinal 
carina above the antennte; vertex not or but slightly depres.sed medially; eyes 
from the emarginatiou to the vertex with a distinct margin ; clyjieus emarginate 
medially, not carinated ; fir.st joint of the flagellum nearly twice the length of 
following joint; space between the eyes at vertex the same as in the preceding 
species, beneath it is a little less; mandibles rufous; head and thorax with sil- 
very pubescence, more obvious from the emarginatiou of the eyes downwards, 
cheeks, sutures of the thorax, on the sides and beneath and the metathorax. 
Thorax finely punctured, shining; metathorax with fine transverse striations; 
the metanotum with a strong depression, from which begins a strong medial 
channel, wdiich extends to the apex of metathorax; wdngs hyaline, apical mar- 
gin fnscou.s, the nervures brown ; legs black, the tibite and tarsi clothed wdth 
sericeous pile, more strongly so on the tarsi; tegulte fulvous ; the first, second 
and base of the third segment reddish, the first segment on the basal two-thirds 
above, black ; second segment strongly raised at base. Length .55 inch. 
(Occurs ill Arizona. 
15. Trypoxylon spiiio*«um Cam. PI. iii, figs. .5, 6 . 
T. spinosa Cameron, Biol. Cent. Am. Hym. ii, j>. 46. PI. iv, figs. 8, 8a. 86, "J, . 
"J, . — Black, shining; front coarsely punctured, medially impressed, above the 
antennae wdth a short longitudinal caidna; space hetw'een the eyes at vertex a 
little broader than the first joint of the flagellum is long, beneath it is equal to 
the length of the second and third joints of the flagellum united ; first joint of 
the flagellum twdce the length of the following joint, slightly longer than the 
second and third joints united, last joint a little longer than the two ])receding 
ones united ; clypeus broadly incurved medially, wdth a tooth in the middle of 
the incurvation ; from the emarginatiou of the eyes dowmvards the cheeks and 
sutures of the thorax and the metathorax wdth golden pubescence, the thorax 
on sides and beneath wdth silvery pubescence. Thorax finely punctured ; meta- 
TRANS. AM. ENT. SOC. XVIII. 
( 19 ) 
.lUNE. 1891. 
