TRIBE XXI. CRYPTORHYNCHIXI. 499 



KEY TO EASTERN SPECIES OF ACALLES. 



a. Thorax not channeled; mesosternum deeply emarginate. 

 &. Thorax with nearly entire median carina. 

 c. Middle of thorax narrower than base of elytra, its disc without 



a T-shaped white mark. 



(I. Form elongate-oval; length 4 mm. 782. CARINATUS. 



dd. Form short-oval, very robust; length 2.5 mm. 783. INFLATUS. 

 cc. Middle of thorax as wide as base of elytra, its disc with a T- 

 shaped white mark. 784. GRANOSUS. 



&6. Thorax not carinate or with a feeble carina on apical half. 

 e. Elytra unicolorous dull gray or brown. 



/. Bristles of elytra soft, slender, strongly recurved; striae deep, 



narrower than the intervals. 785. SORDIDUS. 



ff. Bristles short, straight, feebly inclined; intervals narrower than 



the large punctures forming the strife. 786. POROSUS. 



ee. Elytra with markings of pale scales. 



g. Thorax one-third or more wider than long, wider than base of 

 elytra; bristles very short; larger, 3.7 mm. 



787. suBHisPintrs. 

 gg. Thorax not or scarcely wider than long, never wider than base 



of elytra; bristles longer, clavate; length less than 3.3 mm. 

 h. Pale scales of elytra arranged to form two more or less reg- 

 ular cross-bands, the front one sometimes of isolated spots. 

 i. Smaller, not over 2.5 mm.; thorax slightly longer than 



wide. 



j. Pale scales in part white or whitish, arranged in two 

 more or less interrupted bands. 788. CLAVATUS 



j). Pale scales yellowish, forming a broad basal and post- 

 median band across the elytra. 789. CRASSULUS. 

 ii. Larger, 3.2 mm.; thorax wider than long, as wide at mid- 

 dle as base of elytra; bands of elytra formed of small, 

 widely separated white spots. 790. SYLVOSTJS. 

 hh. Pale scales of elytra scattered irregularly, not arranged to 

 form white bands; length less than 2.5 mm. 



791. MINIMUS. 

 aa. Thorax distinctly channeled; mesosternum broadly and shallowy 



sulcate. 



fc. Form rather slender; median channel of thorax narrower; elytral 



striae fine. 792. PECTORALIS. 



Jfk. Form very robust; median channel broad, deep; elytral striae wide. 



793. VENTROsrs. 

 782 (8763). ACALLES CARINATUS Lee., 1876, 242. 



Elongate-oval. Black, densely covered with dark brown and pale scales, 

 the latter forming on the elytra some indistinct transverse lines, and an 

 oblique zigzag band about the middle. Thorax as long as wide, sides strong- 

 ly rounded; disc widest at middle, much narrower in front, broadly not 

 deeply constricted near tip, coarsely and densely punctured. Elytra oval, 

 at widest part scarcely wider than thorax at middle, sides rounded, basal 

 angles not prominent; stria? composed of large quadrate punctures; third, 

 fifth and eight intervals more convex, each interval with a row of short, 

 thick, inconspicuous bristles. Length 4 mm. 



