AMERICAN COLEOPTERA. 305 



and beneath sparse and fine, the punctures separated as a rule by from two to 

 three times their own diameters. Pubescence of upper surface fine, sparse and 

 inconspicuous, more evident beneath. Prothorax nearly twice as wide as long, 

 sides parallel, narrowed in apical third, feebly sinuate behind, the hind angles a 

 little acute; sides strongly margined; disk feebly convex, longitudinal im- 

 pressed lines deep, arcuate, reaching about to the middle; transverse sub-basal 

 impressed line as usual. Elytra very slightly wider at base than the thorax and 

 nearly four times as long; sides broadly arcuate, surface faintly rugulose and 

 less shining than the thorax; sutural stria very fine, but evident toward the 

 apex. Length 4 mm. 



Ifa6.— Califorula, Lake Tahoe and Kaweah— one example from 

 each locality. 



The few species which we now refer to Mycetina (I have not seen 

 limbata) exhibit somewhat notable differences, especially in oral 

 and sternal structure, the importance of which cannot be deter- 

 mined until the family has been subjected to monographic treat- 

 ment. Perpulchra and homii are certainly congeneric. In them 

 the terminal joint of the maxillary palpi is elongate-conical and 

 scarcely as wide as the second joint; the terminal joint of the labial 

 palpi subquadrate and squarely truncate at apex ; the last joint of 

 the antennse not longer than the tenth ; the prosternum with deep 

 impressed marginal lines which unite at the apex; mesosternum 

 transverse, narrowed in front. While closely allied, they may 

 readily be separated by the form of the thorax— more narrowed in 

 front in perpulchra and the difference in the modification of the 

 male tibise Testacea differs very conspicuously from the two pre- 

 ceding by the abundant pubescence; the second joint of the maxil- 

 lary palpi is not wider than the terminal joint; the labial palpi are 

 smaller, the last joint slender and narrowed apically ; last joint of 

 antennje longer than the tenth ; prosternum more parallel and not 

 margined; mesosternum slightly longer than wide, the sides parallel. 

 In endomychoides the last joint of the maxillary palpi is oval 

 pointed and much stouter than in the preceding species ; the labial 

 palpi are smaller, but apparently formed nearly as in perpulchra 

 and homii; the last antennal joint longer than the preceding; 

 the prosternum is not margined posteriorly; the mesosternum is 

 quite strongly transverse, the sides parallel, the front angles nar- 

 rowly rounded. The femora are less clavate than in either of the 

 other species, being more like Endomychiis biguttatus in this respect, 

 as it also is in the form of the mesosternum and in coloration. 



TRANS. AM. ENT. SOC, XXVII. (39) NOV., 1901. 



