ODYNEItUS. 257 



taken in saying that the post-scutcl is slightly crenulate ; how- 

 ever, one finds under this description sonic variations according 

 to specimens. 



84. ©« dorsalis 1 Fabr. — Validus, niger, valde punctatus ; clypeo 

 integro, metanoto postice striato, utrinque dente armato, marginibus 

 ragosis, obliteratis, nullomodo acutis, canthis 9 nullis, % elevatius- 

 cnlis ; ore, clypeo, an ten 11 arum articulis 1-3, maeulis post-ocularibns, 

 pronoto, scutello, tegulis, rufis ; pronoto medio, post.scutello et abdo- 

 minis primi segmenti margine, flavis ; margine secundi et tertii rugo- 

 sissime punctatis : — % antennis basi, maculaque subalari rufa ; abdo- 

 minis segmentornm margine 20, 3° flavo, secundo reflexo, subcanali- 

 culato ; pedibus flavis, basi nigris ; alis fusco-cyaneis. 



Varied a fuseo et ferrugineo-variegato ad omnino ferrugineum ; primo 

 segmento flavo-marginato. 



Vespa dorsalis Fabr. Syst. Ent. 367, 25 (1775). Ent. Syst. 265, 44.— 



Oliv. Eneycl. Meth. VI, 685, 81. 

 Polistes dorsalis Fabr. Syst. Piez., 273, 19. 

 Rhynchium bait eatumS ay , Bost. Journ. I, 1837, 383, 1. — Say's Entom. Lb 



Conte, II, 764, 1. 

 Monobia sylvatica Sauss. Et. Vespid. Ill, 168. 2 



Rhynchium Lonisianum Sauss. Et. Vespid. 1, 106, 7 ; pi. xiii, fig. 9 3 (1852). 

 Rhynchium dorsale Sauss. Et. Vespid. Ill, 171. 



$ . Total length, 17 mm. ; wing, 14 mm. 

 £ . Total length, 17 mm. ; wing, 12 mm. 



?. Large. Clypeus wider than long, but pyriform, terminated 

 by a truncation or even a little rounded; its surface covered with 

 quite fine punctures. Mandibles long, hooked; armed in the 

 middle of their inner border with 3 or 4 oblique teeth, but their 

 final portion simply cutting, not dentate. Head and thorax 

 densely cribroso with strong punctures ; prothorax retracted 

 before. Scutel briefly truncate, bearing a crenulate crest, inter- 

 rupted in the middle. Metathorax very coarsely punctured, very 

 rugose upon its borders ; quite variable according to specimens; 

 its hinder plate quite flattened, striate, forming on each side a 

 dentiform angle (at times blunted) ; its superior borders some- 

 times quite trenchant, sometimes effaced, scarcely offering tren- 



1 Compare Rhynchium dorsale, page 143. 



2 Compare page 132, No. 3, most likely a different BpeoieS. 



8 On the inscription upon this plate, in place of: 9. Rh. limba/wn. read : 

 10. I\h. litnbatum; and in place of: 10. Rh, Louisanum, read: 9. Rk, 

 a num. 



n 









