J. C. HUTSON 227 



Explanation of Plates 



The following figures were dra\vn b\' the author iu most cases with the aid 



of a camera lucida, and are only intended to be diagrammatic. 



Fig. 1. — Dorsal view of thorax of Sceliphron cyaneum. 



Fig. 2. — Lateral view of Sceliphron cyaneum. 



a, prothorax. ai, neck. a2, collar, ac, anterior coxa, b, meso- 

 thorax. bi, mesonotum. b2, scutellum. bs, mesothoracic epi- 

 sternum (including pre-episternum and episternum) . b4, episternal 

 groove, bji, mesothoracic epimeron. c, metathorax. Ci, post- 

 scutellum. Co, metapleuron (including metepisternum and metepim- 

 eron). Cs, metathoracic epimeron. C4, metapleural lobe, d, 

 median segment or propodeum. di, dorsum of propodeum. d2, 

 end of propodeum. dj, side of propodeum. d4, stigma or spiracle, 

 ds, fovea, de, stigmatal groove, f, funiculus, fw, fore wing, 

 hw, hind wing. 1, lobe, mc, mesocoxa. p, petiole, pc, posterior 

 coxa, s, stigma or spiracle, st, sting, t, tegula. 1 to 6, abdomi- 

 nal plates. 



Fig. 3. — Ventral aspect of abdomen of Sceliphron cyaneum (female) showing 

 the pubescent spots on the third and fourth segments. Lettering 

 as above. 



Fig. 4. — Hind til)ial comb spine of Sceliphron cyaneum. 



Fig. 5. — The \\'ings of Sceliphron cyaneum with the cells named according to 

 the usual nomenclature. 



Fig. 6. — The same wings with the veins named according to the usual nomen- 

 clature. 



Fig. 7. — Fore tibial comb spine of Sceliphron cyaneum. 



Fig. 8. — Frontal view of head of Sceliphron cyaneum, female. 



TRANS. AM. ENT. SOC, XLV. 



