12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i04 



Type: Not designated; co types in BM, also in MCZ (8) and USNM 

 (2) from Costa Rica, van Patten collector; another specimen, in 

 USNM, from Purulhd, Baja Vera Paz, Guatemala, Champion, a 

 locality not mentioned by Jacoby. 



Other localities: Mexico: Cordova, Vera Cruz, F. Knab. Gua- 

 temala: Antigua, J. K. Aldrich; San Jose de Pinula, W. M. Mann; 

 Livingston, Charles Deam; Tamahii, 3,500 ft., C. and P. Vaurie. 

 Costa Rica: Paso Ancho, S. Sebastian, C. H. Ballou, on Vernonia 

 brachiata Bentham; Waldeck, C. H. Ballou, on Polygonum punctatum 

 Elliott; Hamburg Farm, Reventazon, Ebene Lim6n, F, Nevermann; 

 San Pedro de Montes de Oca, C. H. Ballou, on Lycopersicon esculen- 

 tum Miller; San Francisco de Rios. Nicaragua: Chontales, T, Belt. 

 PanamA: Porto Bello, A. Busck. 



Remarks: This is another Disonycha with costate elytra related 

 to D. procera Casey and D. conjugata (Fabricius) of the United States. 

 It feeds primarily on Polygonum. It is a slender insect without 

 pronotal spotting. 



Disonycha bicarinata Boheman 



Figure 9 



Disonycha bicarinata Boheman, in Kongliga Svenska Fiegatten Eugenics resa 

 omkring jorden . . . , Hren 1851-53, vol. 2, Zoologi, pt. 1, Insecta, p. 190, 

 1859. 



Between 6.5 and 8 mm. in length, elongate oblong oval, alutaceous, 

 somewhat shiny; pale yellow; a broad piceous band over back of head; 

 5-spotted pro thorax; elytra with narrow sutural, median, and sub- 

 marginal vittae, not uniting at apex, a costa down the median vitta, 

 most pronounced in the female; body beneath mostly dark with the 

 femora mostly reddish brown. 



Head shining, usually tmpunctate except for the large fovea or group 

 of punctures near eye, interocular space approximately half the width 

 of head; frontal tubercles distinct, a broad flat interantennal area not 

 much produced, a deep piceous band across the entire back of head, 

 sometimes the front darkened, the mouthparts dark. Antennae long, 

 deep brown to piceous, with the basal joints pale-edged. Pro thorax 

 twice as wide as long, not very convex, somewhat depressed over the 

 scutellum and at the sides, surface shining, impunctate, not distinctly 

 alutaceous, with five spots, the largest on the side, the median one 

 elongate. Elytra elongate, a costa along the narrow median vitta, 

 this most pronounced in the female, the narrow sutural vitta not 

 uniting at the apex with the very narrow submarginal one; surface 

 finely punctate and alutaceous, not very shiny. Epipleura with a 

 brownish edge. Body beneath covered with a dense fine pale pu- 

 bescence, the prosternum dark in the middle and with a large dark 

 spot on either side, breast enth-ely dark, abdomen dark along edges 



