NORTH AMERICAN HYMENOPTERA. 175 



of flagellum united ; pronotum strongly furrowed on each side anteriorly, thus 

 forming an anterior ridge which terminates in a strong tooth ; dorsulum com- 

 pactly punctured ; niesopleurse with large punctures, which are not scattered as 

 in the two preceding species, although they are not close by any means ; sculpture 

 of upper surface of middle segment variable, generally with a large fovea medi- 

 ally, on each side of which there are smaller fovea, or numerous irregular ridges ; 

 in one specimen the upper surface is marked by strong radiating ridges, in the 

 middle with a broad channel, narrowed basally; the remainder of middle seg- 

 ment, sides excepted, rather strongly and transversely rugose: first abdominal 

 segment in form intermediate between tenuiglossus and tumidus. Black ; base of 

 mandibles, scape, greater part of i)edicellum, two large spots on pronotum, tuber- 

 cles, line On scutellum, metanotum, tips of femora, tibiiB -except within, a small 

 lateral spot on first abdominal segment, much larger and elongate spots on seg- 

 ments 2-4, and greater part of fifth segment except base and a small black spot 

 laterally, yellow ; tarsi yellow testaceous ; wings on ajiical half subfuscous ; silvery 

 pubescence as usual. Length 8-9 mm. 



% . — Very much like the % tumidm : diifers by the strongly and more closely 

 punctured mesopleurse; flagellum decidedly shorter and stouter ; head and dor- 

 sulum more strongly punctured ; and the tibial shield is darker and narrower, 

 being distinctly longer than broad ; the form is narrower and more lengthened ; 

 markings about the same, except they are narrower on the abdomen, those on 

 pronotum and scutellum sometimes wanting, the metanotum always maculate, 

 however ; first abdominal segment longer than in tumidus % ; femora entirely 

 black. Length 8-9 mm. 



, Texas ; Arizona. The coarser and closer sculpture of mesopleurae 

 will aid in distinguishing this from the two preceding species. The 

 % specimens are placed here with some doubt. The males resemble 

 those of C. peltida Kohl from Mexico, but the first joint of anterior 

 and medial tarsi is shaped differently. 



54. Crabro tuinidu!^ Pack. 



Thyreopus tumidus Packard, 1. c, p. 365, % 9 ■ 



Crabro tumidus Kohl. 1. c, p. 585. 

 9 ■ — Head closely punctured ; lateral impressions of vertex deep ; space between 

 eyes beneath at base of clypeus somewhat less thau the length of the pedicellum 

 and first joint of flagellum united ; pronotum on each side before the anterior 

 margin strongly furrowed, thus forming a short anterior ridge, which terminates 

 laterally in a strong tooth ; punctures of dorsulum and scutellum more or less 

 separated ; mesopleurse with large, shallow, scattered punctures, not striate ; mid- 

 dle segment about as in tenuiglossus, but the sculpture of posterior face coarser, 

 and the large medial fovea of upper face more elongate, the posterior face is also 

 much more widely channeled, and its lateral ridges shorter; first abdominal seg- 

 ment elongate, tumid at apex. Black ; mandibles except apex, scape, two spots 

 on pronotum, tubercles, metanotum, a spot on scutellum sometimes, the tips of all 

 the femora more or less, tibiae except within, an elongated spot on each side of 

 dorsal abdominal segments 2-4, a smaller spot on each side of the fifth, which 

 has sometimes a medial spot, connecting by a narrow line with the laterals, yel- 

 low ; tarsi yellowish testaceous ; silvery pubescence in the usual situations, and 

 abdomen with sericeous pile as in tenuiglossus ; wings pale subhyaliue, darker 

 apically, strongly iridescent. Length 8-9 mm. 



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



