NORTH AMERICAN HYMENOPTERA. 203 



Unideuttfied Species.^ 



93. Crabro frigi«lns Sm. 



Crabro frhjidns Smith, Cat. Hyni. Brit. Mus. iv, 419, ?. 

 " Female. Length oh lines. — Black : the head finely punctured, the cheeks 

 sparingly so, smooth and shining ; the ocelli in a curve on the vertex ; the scape 

 and mandibles yellow, the base and apex of the latter black. Thorax : the meso- 

 thorax longitudinally striated ; the scutellum shining, punctured at the base, and 

 longitudinally striated beyond ; the metathorax with a subdefined half-circular 

 space at its base, which is coarsely striated obliquely ; posteriorly it is very coarsely 

 and deeply rugulose ; a spot on each side of the collar and the tubercles yellow, 

 the anterior lateral angles of the collar subdentate ; the knees, tibiae and tarsi 

 yellow, the apical joints of the latter fuscous, the extreme apex of the tibise with 

 a ferruginous stain ; the wings fusco-hyaline. Abdomen smooth and shining, the 

 first segment very delicately punctured, the following segments more cMstinctly 

 so ; the second and three following segments with an ovate, pale yellow macula 

 on each side at their basal margin ; the apical segment produced into an obtuse 

 tpine, which has a sharp, raised margin, and is covered sparingly with oblong 

 punctures. 



" Hab. — North America." 

 May belong to group singular is. 



94. Crabro Harrisii Pack. 



Crabro pusillus Harris (ncc H.-S.), Cat. Ins. Mass. p. 68 (teste Packard). No 



description. 

 Blepharipus Harrisii Packard, Proc. Ent. Soc. Phila., vi, 376, % . 

 " % . Head as described in B. impressifrons, the impressed line in front of the 

 ocelli being present, the front narrow, depressed ; ocelli in an equilateral triangle, 

 but the head is shorter and more transverse. Orbits and clypeal region silvery, 

 the latter narrower than in the preceding species [scutellatus = % of impresii- 

 frons], proportionately longer and more strongly carinated than in B. impressi- 

 frons. Mandibles slender, bideutate, tip deeply grooved beneath the teeth, black 

 tip rufo-testaceous. Joints of palpi slender, cylindrical, testaceous. Scape of 

 autennje long and slender, clavate, angular, dark brown above, beneath obscurely 

 yellow, basal joint of the flagellum brown, not black, filiform, slender, and longer 

 than in B. impressifrons. Prothorax narrower than in B. impressifrons, with a 

 yellow stripe slightly interrupted by a mesial notch. Mesothorax quite smooth, 

 polished, slightly and sptursely punctured, with long hairs arising from them, en- 

 tirely black. Propodeum with a distinct semi-ovate enclosure, with fine striae 

 diverging from the mesial furrow, which is narrow but distinct; towards the 

 flanks the strite become transverse. Wings immaculate, clear, iridescent, costal 

 nervure dark rufous, posterior nervures testaceous, pterostigma dark. Fore femora 

 reddish yellow, stained with brown externally ; middle femora dark brown, yel- 

 low beneath and at tips: hind femora entirely brown; tibiae yellow, posterior 

 pair tipped with brown ; two anterior pairs of tarsi yellow, posterior ones dark. 

 Abdomen cylindrical, very much rounded above, beneath convex, nearly equal- 

 ing the head and thorax together in length, longer, narrower and slenderer than 

 in B. impressifrons, brown-black, edges of the abdominal segments obscurely pale, 



■••■■ These are not included in the synoptical tables. 



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



