280 THE ENTOMOLOGIST. 



C. Metathoracic spiracles elongated and large (males). 



a. Apex of abdomen red, sometimes fuscous. 



* Front coxae dark. - - - - 21 attentorius, 4 — 6 lines. 

 =;-=:-■ Front coxae pale. - - - '-^5. albatorius, 4|-— 5| lines. 



b. Middle of abdomen red ; hind tarsi white-ringed. 



t Areolet pentagonal. - - - 3'2. arrogans, 4^ — 5 lines. 



ft Areolet almost quadrate. - - - 42. adustus, 4 lines. 



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



a. Abdomen red from the 2nd segment; hind tarsi white-ringed. 



=;= Hind legs black. - - - - 40. leucotarsus, 3 — 4 lines. 



*=!= Hind femora red, base black. - - 34. leucostictus, 3^ lines. 



b. Middle of abdomen red. 



-;= Hind tarsi not white-ringed. 



f Hind tibiae red, apex black. - - - 35. hostilis, 3 — 3f lines. 



ff Hind tibiae black, base whitish. - - 41. tibiator, 8f lines. 



fff Hind legs entirely black. . . . . 4.5. nigripes, 4 lines. 



■'•'■'• Hind tarsi and antennae white-ringed; margins of intermediate 



segments white. - - - 36. porrectorius, 3|- — 4-|- lines. 



Section 5. — Scutellum black ; abdomen red and black, apex white. 



A. Metathoracic spiracles large and elongate (male and female). 

 Abdomen red, apex black ; legs black, front ones paler ; antennae of 



female white-ringed. - - 44. nuhecidatus, 2>^ — 5 lines. 



B. Metathoracic spiracles round, or nearly so, and small (females). 



a. Hind tarsi white-ringed. 



=:= Antennae not white-ringed. - - - - antennatus, 3^ lines. 

 ** Antennse white-ringed, 

 f Apical joint of hind tarsi as long as the 2nd, 3rd and 4th joints. 



57. elegans, 5 — 6 lines, 

 ff- Apical joint of hind tarsi not quite so long as the 3rd and 4th joints. 



amcenus, about 4 lines. 



b. Hind tarsi not white-ringed. 



=;= Coxae and trochanters black (var. of viigrator and cimbicis, red). 

 f Hind tibiae white at the base. 

 I Antennae biculoured. 



§ Post-petiole subtransverse. - - 51. migrator, 3 — 4-|- lines. 

 §§ Post-petiole elongate. . . - . cimbicis, 3 — 3-J lines. 

 \\ Antennae tricolonred. - - - 54. fumipennis, 3 — 4 lines. 

 ff Hind tibiae not white at the base ; hind femora short and thick. 



47. peregrinator, 2 — 4 lines. 

 -i=* Coxae red, middle and hind ones partly black at the base. 



Head partly fulvous ; ? spiracles circular. - 52. rujiceps, 'k^Yn^es. 

 =:=** Coxae and trochanters red. 



X Hind tibiae white at the base. - - 56. incubitor, 2iL — 3 lines. 

 X X Hind tibiae not white at the base. - 57. caniifex, 5 — 6 lines. 



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



a. Antennae white-ringed. .... amcenus, 4^ lines. 



b. Antennae not white-ringed. 



* Base of hind tibiae white, 

 t Hind tarsi white-ringed. 



+ Orbits and bifid mark below anterniae white. - cimbicis, 3J lines. 

 II Orbits only white. 



