ODYNERUS. 101 



Table to assist in the determination of the species of Division 



StENAiNCISTKOCEKUS. 1 



1. Wings fuscous. 



2. Body black, ornaments luteous or yellow. 



„ _, , xi i l 30. f Aztecus. 



3. No separate spots on the second segment. < 



61. I- qnadnsccius. 



3, 3. Two separate spots on the second segment. 39. dejectus. 



2, 2. Body black and rufous. 36. hislrio. 

 1, 1. Wings smoky or subhyaline. 



2. The first abdominal segment rufous. 36. histrio. f>i q 1 



SzX'fi. Insect black and yellow (tbe fasciae sometimes rufous). 



4. Second abdominal segment with a yellow spot on each side. 



5. Segments 1st and 2d only, margined with yellow. 



6. Scutel yellow ; first abdominal segment witbout separate 

 yellow spots, narrow. 33. obliquus. 



6, 6. Scutel black ; segments 1 and 2 with yellow spots, about 



„ ., 38. f sozcularis. *■**'** 



equally wide. \ . 



39. t dejectus. 



5, 5. More than two segments margined with yellow. 



Segments 1, 2,4, margined with yellow. 42. occidentcdis. 

 Segments 1, 2, 5, margined with yellow. 39. dejectus. 

 Segments 1-5 margined with yellow. 43. Paracusis. 



4, 4. Second abdominal segment without yellow spots. 



5. First abdominal segment with a lateral spot on fascia ante- 



riorly. V. ffulvipes. H^ 



40. I Bravo. 

 5, 5. First abdominal segment without lateral separate spot. 



6. Only the first two abdominal segments margined with 



yellow or luteous. 

 7. Anterior margin only of prothorax adorned with yellow. 

 Species of South America. 34. incommodus. 



Species of Mexico. 40. Bravo. 



Species of Chili. \ amh; U" us - 2 



35. I scabriuscuhis. 



7, 7. Posterior margin of prothorax adorned with yellow. 



32. Fariasi. 



6, 6. More than two yellow fasciae. 



7. Anterior margin of prothorax yellow. 41. Guzn 

 7, 7. Posterior margin of prothorax yellow, or prothorax quite 

 black. 44. Sumichras i. 



1 Compare also the tables of Division Ancistrocerus, prop, diet, 

 158), and of Division Stenodynerus. 



2 Vide supra, Division Ancistroccrus, prop. diet, p, 159, 9, et 162, 0. 



