322 SUPPLEMENT. 



8. Promachus truquii. 



Promachus truquii, Bellardi, Saggio etc. ii. p. 30, t. 2. f . 6 \ 



Hab. Mexico 1 , Amula in Guerrero (H. H. Smith), Atoyac in Vera Cruz [Schumann). 



The face has no black bristles, and the hair of the sides of the base of the abdomen 

 is sparse and short. The species was not identified by Osten Sacken. 



EEAX (p. 197). 

 Efferia, Coquillett, Canad. Entom. xxv. p. 175 (1893). 



Table of the Males of the Species represented in the Supplementary Collections 



now under examination. 



1. Three submarginal cells present anomalus, Bell. 



Two submarginal cells as usual 2. 



2. Meson otum compressed, and with a mane-like crest 3. 



Mesonotum not compressed, and without mane-like crest .... 5. 



3. Hair of the head white ; second to fourth abdominal segments with a 



distinct posterior band; sixth and seventh segments silvery . . prolificus, O. S. 



Hair of the head yellowish 4. 



4. Fifth to seventh abdominal segments silvery carinatus, Bell. 



Fourth to seventh abdominal segments silvery concinnatus , sp. n. 



5. The furcation of the third vein occurring before the base of the 



posterior cell 6. 



The furcation of the third vein occurring opposite or beyond the 



base of the second posterior cell 7. 



6. Abdomen largely silvery- white, with white hair directed outwards ; 



front femora and tibiae conspicuously yellow-haired ; hypopygium 



large splendens, sp. n. 



Abdomen with two pairs of white spots and a posterior white ring ; 



hypopygium small maculatus, Macq. 



7. Sixth abdominal segment, except the posterior margin, black . . . dolichogaster, sp. n. 

 Sixth abdominal segment silvery- white, with or without a black spot. 8. 



8. Sixth and seventh segments without black spots cinerascens, Bell. 



Sixth segment, at least, with a black spot 9. 



9. Tibiae wholly black disjunctus, sp. n. 



Tibiae more or less red or yellow 10. 



10. Sixth and seventh abdominal segments each with a large triangular 



black spot guadrimaculatus, Bell. 



Sixth segment wholly silvery, or with a slender black streak . . . 11. 



11. Hind tibiae dilated on the distal two-fifths sagaw, sp. n. 



Hind tibiae normal 12. 



12. Femora with long black hair pavidus, sp. n. 



Femora with yellow hair bimaculatus, Bell. 



