VITTATE CHRYSOMELID BEETLES DISONYCHA — BLAKE 49 



Disonycha didyma, new species 



Figure 65 



Between 5.5 and 6.5 mm. in length, broadly oblong oval, shining, 

 mirror smooth; eyes large; head dark with lower front pale; pro thorax 

 entirely pale; elytra with sutural and marginal dark vittae united at 

 apex, median vitta moderately wide; body beneath with breast, apices 

 of femora, tibiae, and tarsi dark. 



Head dark and polished over occiput down to antennal sockets, 

 with a large fovea on either side near eye, tubercles slightly bulging 

 and with a groove between, interocular space less than half width 

 of head, eyes large, carina a bit produced, lower front long and narrow, 

 labrum dark, the dark from the occiput extending about back of eye 

 and below it. Antennae long, dark, the three basal joints having a 

 pale edge. Prothorax fully twice as wide as long, with wide anterior 

 angles and nearly straight sides, depressed along the base, in some 

 specimens almost a groove, shining pale yellow, not distinctly punc- 

 tate. Elytra wide, shining, very faintly and finely punctate, pale 

 with dark sutural vitta uniting at apex with marginal vitta, a mod- 

 erately wide median vitta. Epipleura dark. Body beneath shining, 

 very finely pubescent, the breast dark; legs with apices of femora, 

 tibiae and tarsi dark. Length 5.5 to 6.5 mm.; width 3. to 3.3 mm. 



Type: Female, and one paratype, also female, USNM 61819, from 

 Summit, Canal Zone, collected by N. L. H. Krauss in October 1944; 

 paratype, female, in MCZ. 



Remarks: This species is not easily distinguished from D. barberi 

 Blake, described from BrownsvUle, Texas. It has much the same 

 coloring and structure, but the elytra are not quite so distinctly 

 punctate and the head markings are not quite the same. Unfor- 

 tunately no male has been examined. 



Disonycha tridyma, new species 



Figure 64 



Between 6 and 7 mm. in length, elongate oblong oval, shining; pale 

 yellow; dark markings on the occiput; entirely pale pronotum; elytra 

 with a sutural and a marginal dark vitta, uniting at apex, and a 

 moderately wide median vitta; body beneath pale, femora dark at 

 apex, tibiae and tarsi more or less dark. 



Head with interocular space less than half the width of the head, 

 eyes large, area between antennal sockets narrowly produced, frontal 

 tubercles well marked, head polished, impunctate except for the large 

 fovea near eye, a dark band across the base of occiput extending 



