278 THE ENTOMOLO'jIST. 



D. Metathoracic spiracles small and round, or nearly so (males). 



a. Antennae white-ringed. 



* Four apical joints of hind tarsi white. 19. digitatus, "2^ — 4i lines. 



=;--* Apical joints of hind tarsi not white. 



\ Hind legs red, apex black. - - 20. grisescens, 3f — 5 lines. 



ft Hind legs black. . . - - 6. monticola, 8 — 9 lines. 



b. AntennaB not white-ringed. 



=1= Metathorax with distinct lateral spines. 



f Areolet almost quadrate ; supero-medial area perfectly closed. 



Coxae and trochanters black. - - 13. jxirvulus, 3 — 4 lines, 

 ft Areolet converging in front; supero-medial area open in front. 

 Femora and tibiae red, apex of hinder black ; internal orbits white. 



IG. bilineatiis, 3f lines. 

 =1==:= Metathorax without lateral spines ; lines of areae prominent ; femora 

 and tibiae red, apex of hinder black. 

 § Mouth and internal orbits white. - 17. stomaticus, 3|- — 4 lines. 

 §§ Face entirely white. 



X Areolet pentagonal or subquadrate. - 18. leucopsis, 3 — 4 lines. 

 X X Areolet subtriangular. - - 7. canalicidatus, almost 5 lines. 



Section 3. — Scutellum pale ; abdomen black. 



A. Metathoracic spiracles elongate (male and female). 

 Antennae of female white-ringed ; face of male white-marked. 



1. vidiiatorius, 2i — 5 lines. 



B. Metathoracic spiracles circular and small (male). 



Greater part of femora and face black ; hind tarsi white-ringed ; 

 segments 2nd and 3rd chestnut-margined, 7th partly white. 



2. bicingulatus, 4 — 5^ lines. 



Section 3. — Scutellum black ; abdomen red or red and black, apex not white. 



1 . Aculeus not projecting. 



Segments 2nd to 4th and greater part of legs red. - 60. bellus, 



2. Aculeus distinctly projecting. 



A. Metathoracic spiracles large and elongate (females). 



a. Antennae black. 



=:: Abdomen red, base black. - - 31. obscurus, 3i — 7 lines. 



=:--:-• Segments 2nd and 3rd and apex of 1st red ; aculeus about one-fourth 



of abdomen. 



f Back part of metathorax slanting ; front femora more or less red at 



the apex. ... - 22. titillator var., 2f — 5 lines. 



ft Back part of metathorax perpendicular ; all the femora black. 



23. obfuscator, 5 lines. 



b. Antennae white-ringed or marked in the middle. 



X Aculeus nearly as long as the body ; base of abdomen and legs red, 

 coxae black. ----- 53. tumidus, 4 lines. 



X X Aculeus not longer than the abdomen. 



■■i' Abdomen entirely red, or base more or less black ; aculeus about as 



long as the abdomen, 

 f Metathorax with two long, acute, lateral spines ; greater part of legs 

 dark. ----- 28. spinosiis, 3^ — 4^ lines, 



ff Metathoracic spines short and stout ; greater part of legs red. 



30. sponsor, 4 — 6 lines. 



