62 
PROCEEDINGS OF THE ACADEMY OF 
P^DBEUS Fabr. 
P. fern oralis, alatus, rufus nitidus, elytris cyaneis grosse punctatis, capite, 
abdominis segmentis ultimis duobus, postpectore pedibusque nigris, his coxis 
femorumque dimidio interiore rufis, antennis tenuibus ad basin rufis. Long. 
•41. 
Two specimens found on the Gila River, below the Pima villages, one was 
subsequently destroyed, and the other is imperfect. Head black, shining 
sparsely punctured, more grossly towards the sides ; before the eyes transversely 
impressed. Palpi rufous. Antennae slender, joints 1 — 3 red, third more than 
twice as long as the second, and blackish at the tip ; 4th and 5th black, the 
others wanting. Thorax oval convex narrowed behind, one fourth narrower 
than the head, a little longer than wide, shining red, with a few very small 
punctures and erect hairs. Elytra as long as the thorax, cylindrical, bright 
blue, grossly and densely punctured ; abdomen smooth, shining red, with the 
last two joints black. Beneath red, postpectus blackish. Feet black, with only 
the coxae and basal half of the thighs red. 
P. u s t u s , alatus rufo-testaceus nitidus, elytris fusco-ferrugineis minus 
dense punctatis, abdominis segmento ultimo antennisque piceis, his basi tes- 
taceis. Long. '18. 
Colorado River, about the junction of the Gila : very abundant in March and 
April. Remarkably different from the other species by the color, which is of 
an almost uniform yellowish red. Antennae slightly thickened externally, 
fuscous with the first four joints rufous. Head with a few large lateral posterior 
punctures. Thorax a little longer than wide, hardly narrower than the head, 
oval convex slightly narrowed behind, truncate at base, disc with a few scat- 
tered punctures. Elytra convex usually dark ferruginous, sometimes hardly 
darker than the rest of the body, as long as the thorax, strongly not densely 
punctured. Abdomen very sparsely punctured, last joint piceous. 
COLASTUS Er. 
C. obliquus, depressus ovalis, niger griseo-pubescens, thorace subtilius 
punctato, antrorsum angustato, margine angusto testaceo postice latiore, elytris 
subtilius punctatis, obscure rufo-testaceis, limbo laterali postice latiore apicali- 
que nigris, sutura paulo infuscata, antennis nigris, pedibus obscure rufis. 
Long. "1. 
Variat (immaturus), piceo-testaceus, elytrorum disco a humeris ad suturae 
apicem pallidiore, versus scutellum infuscato. 
Colorado River, California. Of the same size and form as the next species, 
from which it differs by the less dense punctuation of the thorax, and by the 
lateral black margin of the elytra being gradually broader from the humerus, 
and by the base not being margined with black. 
C. limbatus, depressus ovalis, niger griseo-pubescens, thorace confertis- 
sime subtilius punctato, antrorsum angustato, margine angusto angulisque 
posticis indeterminate testaceis, elytris confertim subtilius punctatis, testaceis 
limbo omni fequali suturaque nigris, abdomine subtilissime punctulato, pedibus 
antennisque testaceis, his clava paulo infuscata. Long. •!. 
Colorado River, near the Gila. 
Carpophilus Leach. 
C. discoideus, oblongus fere depressus, piceus nitidus, subtiliter pubes- 
cens, thorace brevi, lateribus rotundatis marginatis, subtilius punctato, elytris 
thorace duplo longioribus, fortius marginatis, subtilius punctulatis, macula 
testacea triangulari postice truncata antice attenuata utrinque ornatis ; pedibus 
antennisque rufis his clava paulo infuscata. Long. -09. 
One specimen found at the Colorado River, near the Gila. Somewhat allied 
toC. marginatus Er,, but larger, more regularly oblong and more flat- 
tened. 
[March, 
