CRABRO PATELLATUS. 151 



28. Crabro patellatus. 



C. niger, flavo-maculatus ; mesothorace punctate. Faun. 

 C. antennis subfusiformibus ; tibiis scutelloque obscuris, punctis 

 lineisque hyalinis. Mas. 



Crabro patellatus, Panz. Faun. Germ. 46. 4 $ & 46. 9 ? . 



Fan d. Lind. Obs. ii. 43. 3. 



Shuck. Foss. Hym. 128. 2. 



Dahlb. Hym. Europ. i. 356. 232. 



Wesm. Hym. Foss. Belg. 145. 24. 



Thyreopus patellatus, St. Farg. Ann. Soc. Ent. Fr. iii. 756. 3; Hym. 

 iii. 161. 3. 



Female. Length 5-6 lines. Black ; head pubescent and finely 

 punctured, the vertex irregularly concave; the face smooth, 

 shining, and canaliculated ; the scape yellow beneath; the 

 inner orbit of the eyes and the clypeus covered with dense sil- 

 very pubescence, the latter carinated in the centre ; the man- 

 dibles yellowish at the base, the apex rufo-piceous at the apex. 

 Thorax subpubescent ; the mesothorax and scutellum shining, 

 with scattered delicate punctures ; the metathorax with a deep 

 longitudinal incisure, widest at its base ; a half- circular sub- 

 enclosed space at its base, which is coarsely reticulated and 

 shining, the posterior portion rugose, with the lateral margins 

 raised; the collar with sometimes a yellow spot on each side, 

 and sometimes the tubercles yellow, occasionally a spot on the 

 scutellum; the wings fusco-hyaline, with a darker cloud at 

 their apical margins, the nervures and tegulae rufo-testaceous ; 

 the tibiae and tarsi yellow, the anterior and intermediate tibiae 

 black beneath, the posterior pair ferruginous at their apex 

 within ; the tarsi ferruginous, with their basal joint yellow ; 

 the anterior tarsi ciliated exteriorly, and all the tibiae spinose. 

 Abdomen elongate-ovate, the first segment narrowed into a 

 petiole at its base, with five yellow bands, the second and 

 third generally interrupted, and the fourth and fifth usually 

 entire, the first sometimes slightly interrupted, the second 

 broadest ; beneath immaculate, with the apex ferruginous. 



Male. Length 4-5 lines. Differs in having the flagellum sub- 

 fusiform, its six basal joints concave beneath, the seventh and 

 three following joints serrated on the exterior, and the first five 

 fimbriated within; the anterior coxae produced at their apex 

 into a long acute tooth ; their trochanters flat beneath ; their 

 femora dilated posteriorly, flat, and having at their base beneath 

 a long curved spine ; their tibiae dilated posteriorly into a con- 

 cavo-convex plate ; the tarsi dilated, the first joint concave 



