NORTH AMERICAN HYMENOPTERA. 179 



but little, if anything, more distinctly so than the penultimate ; coxpe in part, 

 trochanters, fore femora except an elongate spot behind, the medial pair except a 

 line above and behind, hind pair beneath except apex, four anterior tibiae and 

 tarsi entirely, hind tibiae at base and within, yellow ; flagellum testaceous beneath • 

 sixth dorsal segment seldom spotted with yellow. Length 7-9 mm. 



Montana. The markings are remarkably constant in the forty 

 some specimens before me. 



58. I'rabro liilaris Sm. 



Crdbro hilaris Smith, Cat. Hym. Brit. Mus. iv, 416. 9 • 



Thyreopns cimjidatus Packard (in pt.), Proc. Ent. Soc. Phila., vi, 306, % J . 



9. — Clypeus not strongly carinated, its fore margin broadly truncate; head 

 finely and closely punctured, most densely so on the front, which is indistinctly 

 punctato-striate ; first joint of flagellum about as long as the following two joints 

 united ; pronotum well developed above, rather long, dentate laterally ; dorsulum 

 strongly and tolerably closely punctured ; episternum and epimerum metathoracis 

 distinctly striated, though not C(jarsely so : middle segment above with coarse, 

 irregular ridges forming broad foveas, whose shape, size and prominence vary, on 

 the posterior face these ridges are transverse, central longitudinal channel deep, 

 but little widened basally and interrupted at base of posterior face by a large 

 fovea, sides of middle segment, except medially, which is sparsely punctured, 

 with fine striae. ; medial and hind tibia strongly spiiiose ; abdomen above, except 

 the first segment, densely and microscopically punctured : pygidium broad, tri- 

 angular, slightly convex, covered with large, separated punctures, and on apical 

 portion densely clothed with appressed goldeli pubescence. Black ; mandibles on 

 basal two-thirds, cly]jeus except narrow apical margin, scape entirely, sometimes 

 pedicellum, pronotum above, tubercles, episternum mesopleuralis, scutellum and 

 a dot on each side anteriorly, two spots on metanotum (postscutellum), sometimes 

 the coxae and trochanters in part, tips of all the femora, particularly the fore and 

 medial pair, tegulae, except a spot within, the size of which varies, and which is 

 sometimes entirely lacking, a band on the first dorsal segment before apex, two 

 transverse spots on segments 2 and 3, narrowed within and sometimes touching, 

 a band on segments 4 and 5, and irregular markings on ventrals 2-4, yellow ; tarsi 

 except first joint, and apex of hind tibiae, testaceous ; clypeus and thorax beneath 

 sparsely and cheeks with silvery pubescence ; color of wings varying from fusco- 

 hyaline to subhyaline, the nervures and stigma testaceous. Length 9-10 mm. 



'J, . — Clypeus narrower than in the 9 , its fore margin truncate and dentate 

 laterally ; flagellum tolerably slender, somewhat subclavate. indistinctly fringed 

 with hair beneath ; dorsulum more strongly punctured, towards the sides punc- 

 tato-striate ; middle segment more coarsely ridged ; first joint of hind tarsi, com- 

 pared with the longer spur of hind tibiae, a little longer ; last two dorsal segments 

 of abdomen strongly punctured, the ultimate more distinctly so than the penul- 

 timate ; in addition to the markings of the 9 . the first two or three joints of 

 the flagellum, the femora except a dark spot on outer side, four anterior tibiie 

 entirely, and greater part of abdominal segments 1 and 2, yellow ; the markings 

 on dorsal segments 5 and 6 sometimes obsolete ; wings subfuscous. Length 7-10 

 mm. 



Fh)rick: St. John's Bhiff (Smith), St. Augustine (Johnson), 

 Jacksonville (Ashmead) ; Texas; Illinois. An examination of the 



TRANS. AM. ENT. SOC. XXII. JUNE, 1895. 



