8 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



The names used for the trees in the present work are according to 

 Sudworth. 1 



KEY TO THE SPECIES OF AGRILDS 



1. Tips of the elytra prolonged 2. 



Tips of the elytra not prolonged 5. 



2. Elytra with pubescent markings — 3. 



Elytra without pubescent markings (1) ferrisi Dury. 



3. Scutellum transversely carinate; pubescence on elytra forming designs; 



elytral tips arcuately emarginate on inside and forming an acute tooth 



near outer margin 4. 



Scutellum not carinate ; pubescence on elytra not forming designs ; elytral 

 tips produced into an acute tooth at middle (2) nevadensis Horn. 



4. Posterior and anterior median depressions on pronotum equal in width; 



pubescence on elytra yellowish white (3) subtropicus Schaeffer. 



Posterior median depression on pronotum distinctly wider than anterior 

 depression; pubescence on elytra brownish yellow (4) lucanus Fall. 



5. Antennae serrate, beginning at fourth joint 6. 



Antennae serrate, beginning at fifth joint 84. 



6. Tarsal claws cleft in such a manner that the inner portion is turned inward, 



nearly or quite touching that of the opposite side 7. 



Tarsal claws simply cleft, the inner portion not, or only feebly turned 

 inward, and the tips distant 30. 



7. Pygidium with a projecting carina 8. 



Pygidium without a projecting carina 10. 



8. Body above uniformly black (5) champlaini Frost. 



Body above bicolored ; head and pronotum aeneous or cupreous ; elytra 



black or piceous 9. 



9. Front of head deeply depressed; elytra black, and without distinct pubes- 



cence; body beneath black (6) ruficollis (Fabricius). 



Front of head feebly depressed ; elytra piceous, and uniformly clothed with 

 very short hairs; body beneath aeneous or cupreous— (7) lateralis (Say). 



10. Lateral margins of first two abdominal segments nearly or entirely ob- 



literated ' 11. 



Lateral margins of first two abdominal segments distinct 12. 



11. Pronotum deeply depressed on disk and along lateral margins ; scutellum not 



transversely carinate (8) obtusus Horn. 



Pronotum not deeply depressed on disk nor along lateral margins ; scutellum 

 transversely carinate (9) difficilis Gory. 



12. Head concave or deeply depressed 13. 



Head not concave nor deeply depressed 15. 



13. Front of head concave or very deeply depressed, the concavity extending to 



the lateral margins and epistoma ; large species, 12 millimeters 14. 



Front of head with a narrow depression on the vertex and occiput, but the 

 depression not extending to the lateral margins; small species, 5-6 

 millimeters (10) cupricollis Gory 



14. Sides of pronotum densely clothed with orange yellow pubescence, and the 



median depression not interrupted at the middle. 



(11) cupreomaculatus Duge& • 

 Sides of pronotum not densely pubescent, and the median depression inter- 

 rupted at the middle (12) fuscipennis Gory. 



» Check List of the Forest Trees of the United States, Their Names and Ranges (U. S. 

 Dept. Agric, Miscellaneous Circ. 92, 1927, pp. 1-295). 



