144 HYMENOPTEEA. 



are from the eyes. Antennae stout, covered with a white pile ; the third joint distinctly 

 longer than the fourth. Thorax bearing a pale pubescence ; rugosely punctured ; the 

 pleurae shining, nearly hidden by a white longish pubescence. Pronotum almost 

 transverse, the lateral angles acute, oblique, and closely pressed to the head ; the 

 pleurae oblique, sharply separated, and narrowed to the presternum . The mesonotum 

 is coarsely rugosely striolated ; in the middle is a large wide depression, the surface 

 at the sides of this being raised and keeled. Scutellum convex, the base before the 

 fovea oblique. Metanotum shining, impunctate. Median segment finely rugose, short, 

 semiperpendicular at the apex ; the sides and metapleurae densely covered with longish 

 white hair. Abdomen shining, the segments depressed at the apex ; the apical half of 

 the petiole and the second and third segments bearing large, distinctly separated 

 punctures ; the other segments with the punctuation much finer and indistinct. Legs 

 bearing a white pubescence ; the long spur of the hind tibiae reaching to the middle of 

 the metatarsus, which is longer than all the other joints united. The scape of the 

 antennas beneath, an interrupted line on the pronotum, the tubercles, two closely 

 united marks on the sides of the scutellum at the base, the metanotum, a line on 

 either side of the abdominal segments 1-5 (that on the first and second much shorter 

 and wider than the others), two small marks on the hypopygium, a line on the four 

 front femora and one on the hind tibiae, and the spurs, clear yellow ; the tibiae fusco- 

 testaceous. Wings hyaline, the stigma and nervures fuscous ; the transverse cubital 

 nervure received before the middle of the radial cellule — more than twice the length 

 of the turned-up branch of the radial nervure from the stigma. 



-/ 4. Crabro sonorensis. (Tab. IX. fig. 4, $ .) 



Niger, dense punctatus et albo pilosus ; pedibus fulvis ; abdominis segmentis 3°-6 m late flavis ; alis fulvo- 



fumatis, stigmate ochraceo. $ . 

 Long. 13 millim. 



Hab. Mexico, Northern Sonora (Morrison). 



Vertex not depressed, bearing a uniform and moderately strong punctuation. Ocelli 

 in a curve, the hinder ones separated by a greater distance from the eyes than they are 

 from each other, and separated from each other by one and a half times the length of 

 the fourth antennal joint. Frontal depression shining, impunctate; the basal part 

 much narrowed, hardly half the width of the rest ; the apex rounded. Cheeks regular, 

 hardly depressed. Clypeus carinated in the centre. Third antennal joint nearly one 

 fourth longer than the succeeding joint. Collar with a moderately wide furrow in 

 the centre ; the furrow behind it wide and deep ; the edges oblique, slightly incised. 

 Mesonotum with a wide, but not very deep, depression in the centre, reaching to the 

 collar but not to the scutellum. There is no furrow between the epimera and the 

 sternum of the meso thorax ; the furrow behind the tubercles is wide and shallow, and 

 there is a narrower furrow with a stout keel in front of them. Scutellum moderately 

 convex ; furrowed at the base and apex ; not twice the length of the second tarsal 



