296 H. C. FALL. 



I. 



Antenna} ( % ) with joints 4-6 having a prolongation from tlieir upper side. Mid- 

 dle tibiae of % flattened, and near the tip somewhat contorted. Black, 

 occiput red, with median black line. Length 25-29 mm. Hah.— 



Texas, near the Mexican border eucera. 



Autennje ( % ) with the fifth joint excavated and prolonged upward at the distal 

 end. Head (except in front) and thorax red, elytra finely scabrous. 



Length 20-25 mm. Ha6.— Arizona mtitilata. 



Antenna} ( % ) with joints 4-7 elongate-triangular, the apex slightly produced on 

 the under side. Black, head behind the eyes and thorax, rufous. 



Length 18 22 mm. J^flft.— Cape San Lucas penin!«ularis. 



Antennae {1, ) with the intermediate joints, usually 4-7, more or less enlarged. 



Pygidium of % elongate and dilated at tip; head black, thorax and elytra 



yellow, the former with four small black spots in a transverse line, the 



latter with a smaller black spot at basal third, and a larger one at 



apical third. Length 15-20 mm. Hab. — Texas, near the Mexican 



border quadriniaculata. 



Pygidium of %, elongate and more or less acute at tip (except deserticola) . 

 Head and thorax more or less rufous; middle tibiiP of % not compressed 

 near the apex. 

 Thorax pentagonal, angulate at sides. 



Legs black ; thorax not tuberculate at sides; head orange-yellow, black 

 between and before the eyes, rarely entirely black; thorax orange- 

 yellow, often with a median black stripe, rarely black except the 

 lateral angles; elytra scabrous or obsoletely reticulate. Length 10-28 

 *mni. Hab. — California (San Diego to Owen's Valley), thence north- 

 ward by the desert regions of Nevada to Southern Oregon. 



Tulnerata. 



In the var. coopo-ri the elytra are coarsely reticulate, varying to finely 



reticulate; it occurs in California, Oregon, Washington and Idaho. 



Legs black; thorax trituberculate each side behind the lateral angles; 



head and thorax red, labrum and epistoma black : elytra black. 



coarsely reticulate. Length 25 mm. Hah. — Santa Margarita Island 



(Lower California) margarita. 



Legs red, tarsi blackish ; head and thorax red, elytra black, strongly re- 

 ticulate. Length 23-35 mm. Hah. — Owen's Valley, California, to the 



Gila River, Arizona inagister. 



Thorax subtransverse, broadly rounded at sides, marked with a transverse 

 row of four small black spots; femora red, tipped with black; tibia; 

 and tarsi black ; elytra finely reticulate. Length 18-25 mm. Hah.^ 



Arizona and New Mexico. deserticola. 



Color entirely black ; middle tibia; of % rather strongly compressed near 

 the ajiex. 

 Thorax subpentagonal, not angulate at sides, as wide as or slightly wider 

 than long; joints 4-7 of % antennae enlarged, 5 and 6 largest, but 4 

 and 7 much larger than 8 ; sixth ventral of % with a deep and 

 broadly rounded emargination, the lateral angles acutely produced ; 

 pygidium sinuate before the apex, which is acutely pointed; color 

 black. Length 15-19 mm. Hah. — Southern California (Foway, War- 

 ner's Ranch, Temecula) inorosa. 



