436 CALIFORNIA ACADEMY OF SCIENCES. 



triangular flattening from the apex toward base, finely, 

 sparsely punctate a broad vitta of fulvous hairs each side, 

 black along the middle. Scutellum black. Elytra nearly 

 twice as wide as the base of the thorax, disc faintly tri- 

 costate, one costa on the deflexed sides the other two su- 

 perior within the humerus, surface densely finely punc- 

 tate, clothed with short fulvous hairs. Body beneath and 

 legs deep blue-black, shining. Abdomen sparsely punc- 

 tate. Length, .36-. 40 inch; 9-10 mm. 



The male has the last ventral segment deeply emargi- 

 nate, in the female it is simply truncate. This species 

 belongs to Champion's group i-a characterized by filiform 

 antenna; in both sexes, and with the first four joints of 

 the front and middle tarsi and the third of the hind tarsi 

 tomentose beneath. 



From the figures given by Mr. Champion of many of 

 his species there is no indication of as elongate a head as 

 the present species. In fact, the head is nearly as elon- 

 gate as in Rhinoplatia. 



Collected in southern Arizona (Morrison). 



Macrobasis tenuilineata n. sp. 



Elongate, castaneo - testaceous, moderately densely 

 clothed with grayish white pubescence forming three 

 slender more distinct lines on the disc of each elytron 

 and one less distinct at the sides. Antenn£e slender, 

 black. Head densely punctured. Thorax longer than 

 wide, sides convergent in front, parallel behind the mid- 

 dle, surface densely punctured, a finely impressed me- 

 dian line. Elytra parallel densely punctured, cinereo- 

 pubescent distinctly denser in three lines on the disc of 

 each. Body beneath densely punctured and pubescent, 

 the apical margin of each ventral segment piceous. Legs 

 concolorous the knees piceous. Length, .40-. 55 inch; 

 10-14 mm. 



