VITTATE CHRYSOMELID BEETLES DIRONYCHA — BLAKE 25 



Disonycha knabi^ new species 



Figure 14 



From 4.8 to 5.5 mm. in length, oblong oval, moderately shining 

 although finely aliitaceous, very finely punctate; pale yellow; deep 

 reddish brown antennae, occiput, frontal tubercles, and tarsal joints; 

 two large dark reddish brown pronotal spots more or less combined 

 anteriorly; dark brown narrow sutural and submarginal elytral vittac 

 not united at the apex, and a moderatelj^ broad dai'k median vitta. 



Head with interocular space a little more than half the width of the 

 head, the lower front somewhat elongate, carina long, broad, slightly 

 produced, frontal tubercles swollen and well marked, usually dark, 

 occiput deep reddish brown, polished, a cluster of coarse punctures on 

 either side near eye, labrum dark, one specimen with a fovea in the 

 middle of the occiput. Antennae deep reddish brown, rather short, 

 the distal joints broad. Prothorax not twice as broad as long, moder- 

 ately convex, with rounded sides and little trace of basal depression 

 over scutellum, shining, impunctate, pale yellow with two large 

 piceous spots anteriorly, sometimes coalescing and usually with a 

 deep brownish area between them and below them, sometimes faint 

 traces of a smaller pale brown lateral spot on each side. Scutellum 

 dark. Elytra somewhat shiny although finely alutaceous and very 

 finely punctate, pale, with a narrow dark sutural vitta and a sub- 

 marginal vitta not united at apex and a moderately broad median 

 vitta. Epipleura pale. Body beneath and femora and tibiae pale, 

 the tarsal joints deep reddish brown. Length 4.8 to 5.5 mm., width 

 2.5 to 2.8 mm. 



Type: Male, and two para types, female, USNM 61811, and one 

 paratype, MCZ, all taken by Frederick Knab at Acapulco, Mexico, 

 on July 27. 



Remarks: In its oval shape and markings on the pronotum this 

 species somewhat resembles D. fumata LeConte, but D. knabi is a 

 smaller and paler species with shorter antennae. The aedeagus is 

 somewhat like that of D. fumata. 



Disonycha tenuicornis Horn 



Figure 17 



Disonycha tenuicornis Horn, Trans. Amer. Ent. Soc, vol. 16, pp. 201, 208, 1889. — • 

 Blake, Proc. U. S. Nat. Mas., vol. 82, art. 28, p. 32, 1933. 



Between 6 and 7 mm. in length, oblong oval, somewhat shiny, elytra 

 finely alutaceous ; pale yellow ; a small dark spot on either side of base 

 of head; two small dark spots anteriorly on the prothorax; very narrow 



319188—55 4 



