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THE AMERICAN NATURALIST. [Vor. XXXIX. 
. Smaller, length not over 7 mm. (Mexico) . : : . linctus 9. 
Larger, length 8 mm. or more ; females 
Species of Mexico . Zrichecus, transvorsus, RE er an 
Species of unknown origin, but closely allied to Æ. pacificus Ckll., 
with the size smaller; the enclosure of metathorax shorter, with 
finer striz, etc. : : citerior. 
. Species of Mexico . PON tricnicos, diis, SEHR pharus, 
costalis, spinalis, and pallicornis, the last based on a d 
Species of Britisb Columbia and ray State; 9 roj mm. long, 
black : . egregius. 
Species of Colorado ; d 7i mm. Aat bitk, the apical half of the 
clypeus yellowish . . colatus. 
Posterior face of metathorax with | a distinct share mar : IO. 
Posterior face of metathorax with the lateral margins at least pariy 
rounded ; ; i ; à ; i 
. Females * i : : à i i = v 
es : : ; , soc dis 
. Smaller, length m iil 7 mm. (Mexico) i . respersus and laneus. 
; noh 
Largest, length 8-81 mm.; black South Coral, New York, 
i crassus. 
. Abdominal baois at habs of vd. I to 3 entire (Colatado) 
. granosus. 
Abdonddsl bands iduce, PER 2 d 3 having sus small grayish 
spots on each side (Washington i doe : : . occultus. 
. Legs black (Mexico ?) Pon en ur MEM 
At least the tarsi partly yellow . 
I5. 
. Labrum black (California; a black species 8i mm. long palit. 
16. 
Labrum yellow or testaceous 
Mandibles black, at least basally, never ve ` . Kk TA 
Mandibles more or less spotted with yellow 19. 
Anterior tibia without a yellow stripe ; tubercles and egin not 
spotted with yellow (Colorado) . green 
Anterior tibia "mes with ers tobetelés ad d tegul with a yellow 
18. 
spot 
Larger, legi "di mm., u below ‘the antennae longer (British 
olumbia) . arctous. 
Smaller, length 7 mm. a oe Dich the antennae shores (California 
ns. 
« Tubercles dark ; on short, eyes converging below ; ie area of 
metathorax acon semicircular, entirely N > irregular stri- 
olæ ; length 7-71 mm. (Colorado) . : nigricollis. 
1 H. crassus is said to differ from Æ. similis Sm., by its larger size, and the 
smoky yellow tint of the wings, and from Æ. fulgidus Crawf., by the color of the 
wings and the less punctured abdomen. : 
