AMERICAN COLEOPTERA. 127 



striction. Elytra oblong, slightly wider behind, sides straight from the humeri 

 to the apical third in the male, broadly arcuate in the female; strial punctures 

 small, the interspaces fully twice as wide as the punctures; setae of the strial 

 punctures scarcely longer than the width of the interspaces, straight, moderately 

 inclined ; those of the interspaces about equal in length, but somewhat more 

 erect, and alternating on every interspace with setae of about double their length ; 

 entire base in front of a line running obliquely backward from just behind the 

 humerus to the suture, rather thickly clothed with recumbent yellowish white 

 hair; apical third similarly but more sparsely clothed, and with intermediate 

 scattered hairs, especially near the suture. Metasternum distinctly longer than 

 the second ventral segment, the fourth ventral not much shorter than the fifth 

 and more than half as long as the third. First joint of hind tarsus barely as 

 long as the two following united. Length 2i-22 mm. 



Arizona (Tucson and Hot Springs) ; collected by Barber and 

 Schwarz, and Wickham. 



ANOBIIN^E. 



The insects of this subfamily are for the most part of a slightly 

 depressed ^cylindrical form, but vary to broadly oval or nearly glo- 

 bular. The mentum is trapezoidal or more rarely subtriangular ; 

 labrum short and transverse; eyes rounded and usually prominent; 

 antennae inserted just before the eyes, of variable form but very 

 often with the last three joints much elongated, especially in the 

 male. Head deflexed and usually nearly or quite invisible from 

 above, the prothorax more or less excavated beneath for its recep- 

 tion, except in the first two tribes and in the Ptiliuini. The pro- 

 thorax is usually margined at sides; scutellum distinct; body 

 winged. Coxae either approximate or separated, the anterior usually 

 conical and prominent, the posterior, except in the Hedobiini, more 

 or less distinctly sulcate for the reception of the femora. Legs 

 moderate or short, femora not distinctly clavate, except in Ptinodes ; 

 tarsi sometimes slender, sometimes dilated ; joints 1-4 decreasing in 

 length ; claws divaricate, simple, except in Trichodesma. 



This subfamily is divisible into six tribes as follows: 



Front not margined, nor with impressed line over the base of the antennas ; hind 

 coxae not grooved for the reception of the thighs ; prothorax not mar- 

 gined at sides Hedobiini. 



Front margined more or less acutely or with an impressed line above the an- 

 tennae; hind coxae more or less distinctly sulcate; prothorax margined 

 at sides, except very rarely 2. 



2. Antennae of male strongly flabellate; exterior margin of front tibiae prolonged 

 at tip in a horizontal dentiform process, the margin above the tooth 

 finely serrulate or denticulate; form of body and sculpture varying in 

 the sexes 6. 



TRANS. AM. ENT. SOC. XXXI. APRIL, 1905. 



