NATURAL SCIENCES OP PHILADELPHIA. 45 



taceous, "13 -15. L. Superior and Hudson's Bay Terr, tf with the ventral 



segments broadly channeled. Hallomenus niger Hald. . 1. nigra Lee. 



Thorax one-half wider than long, mouth and base of antennae very dark 



testaceous, -11 -15. California. 2. at ra Lee. 



Head, thorax and body black ; elytra brownish yellow : 

 Thorax scarcely wider than long, '15. Cala. and Sitka. A. luteipennis 

 Lee. .......... 3. s e rice a Mann. 



Thorax one-half wider than long, *12 -14. Georgia and Minnesota. 



4. flavipennis Hal. 



Thorax and elytra brownish yellow : 



Thorax one-half wider than long; head yellow; antennae and abdomen 

 usually fuscous, sometimes yellow, *12 -15. Southern, Middle and Western 

 States, Canada, Sitka. A. pallescens Mann. ; ventralis Mels. ; jiliformis Lee. 



5. rufa Say. 

 Thorax one-half wider than long, head black, antennae and body fuscous, 

 the former pale at the base, *10 *13. Washington Territory. 



6. nigriceps Lee. 



Thorax nearly twice as wide as long ; entirely uniform yellowish brown, 



more robust than the preceding, *05. Colorado Desert. . 7. pus io Lee. 



Thorax yellow, elytra and body black : 

 Thorax a little wider than long, anterior and middle thighs partly testa- 

 ceous ; transverse lines of elytra more distinct than usual, *12. San Diego, 

 Cala. . . . . . . . . . . 8. collaris Lee. 



Tribe II. MORDELLINI. 



Hind coxae very large and fiat, metasternum short ; hind tibiae dilated ; 

 claws cleft to the base, with the upper portion strongly pectinate ; last dor- 

 sal segment conical, prolonged, sixth ventral not visible. Eyes oval, emargi- 

 nate, antennae more or less serrate, inserted in front of the eyes under a frontal 

 margin. Body pubescent, very finely punctulate. 



Tomoxia Costa. 



The species of this genus are cuneiform, of a blackish color, varied with 

 irregularly diffused gray pubescence ; the scutellum is emarginate behind, 

 the anal style is short and obtuse ; the hind tibiae and tarsi without ridges, 

 except the short subapical one of the former ; the eyes are finely granulated, 

 the antennae tolerably strongly serrate, and the last joint of the palpi is more 

 or less elongate, triangular and moderately thick, with the extremity hollowed 

 out. 



The species are found running on the bark of trees which are partly dead ; 

 three are known to me, 



A. Last joint of maxillary palpi long triangular ; base of thorax rounded 



at the middle. 

 Elytra with broad lines not extending behind the middle ; a posterior fascia 

 composed of spots and the apical margin cinereous ; of the dark markings 

 a rhomboidal spot each side near the base is most characteristic, *3S - 5. Mid- 

 dle and Western States. ..... 1. b id e n t a t a (Say.) 



B. Last joint of maxillary palpi securiform ; base of thorax subemarginate 



at the middle. 



Elytra with narrow lines and subapical fascia cinereous, dark markings all 

 narrow, '21 '32. Middle States. . . . . 2. lineella. 



Elytra with a broad basal fascia including each side a round dark spot, 

 transverse spot behind the middle, apex, suture and margin cinereous, -19. 

 Western States 3. i n c 1 u s a. 



1862.] 



