DISONYCHA. 313 



20. Disonycha recticollis. (Tab. XVIII. fig. 25.) 



Below piceous ; femora and apex of the abdomen fulvous ; base of the head, antennae, and tarsi black ; above 

 testaceous ; thorax impunctate ; elytra extremely minutely punctured ; a narrow sutural and lateral 

 stripe, and another wider one at the disk, black. 



5 . The black discoidal elytral stripe raised in shape of an acute ridge. 



Length 2|-3 lines. 



Head smooth, impunctate at the middle, the sides near the eyes with a few punctures ; antennae two thirds 

 the length of the body, the first joint more or less fulvous below, the rest black, fourth joint distinctly 

 longer than the third ; thorax transversely subquadrate, not narrowed in front, the sides rounded, the 

 posterior and anterior margin straight ; all the angles obsolete ; scutellum black; elytra extremely finely 

 punctured when seen with a strong lens, testaceous, their outer margin and that of their epipleurse of the 

 same colour ; underside black or piceous, the last one or two abdominal segments fulvous ; tibiae and 

 tarsi black. 



Hab. Mexico, Cordova (coll. Salle) ; Guatemala (coll. Jacoby, Salle), Tactic 

 (Champion); Nicaeagua, Chontales (Belt); Costa Eica (Van Patten). 



Numerous specimens of this species were obtained in Costa Rica. I have no doubt 

 of its specific distinction from D. alternata and allied forms. In these latter the 

 thorax is always wider at the base than at the apex ; here, on the contrary, the 

 shape is transversely subquadrate, by which the male insect may be alone separated ; 

 in the female the intermediate black elytral stripe (which in both sexes is always 

 distinctly wider than the two others) is longitudinally deeply depressed at the sides, the 

 stripe itself forming an acutely raised ridge, abbreviated as usual at the apex ; the 

 colour of the underside is also constantly black, with the exception of the last two 

 abdominal segments in both sexes. Whether this species may be but a variety of D. 

 bicarinata, Boh., to which it is evidently closely allied, I am unable to say ; but as 

 the latter insect is described from Brazil and with the thorax spotted with black, of 

 which no trace is visible in the many specimens before me, I have thought it best to 

 consider it as distinct from Boheman's species. I may further add that even in the male 

 insect traces of the elytral longitudinal costa may be seen. 



21. Disonycha panamensis. (Tab. XIX. fig. l.) 



Below and the legs fulvous ; thorax impunctate, marginate at the sides ; elytra minutely punctured and rugose, 

 testaceous, a broad longitudinal stripe at the middle black, a sutural and lateral stripe fulvous or piceous. 



Length 3 lines. 



Head impunctate ; the frontal tubercles indistinct and divided in front by a distinct fovea ; another small 

 fovea is placed at the vertex ; antennae long, slender, the first two or three joints fulvous, the rest black ; 

 fourth joint longer than the third ; thorax fulvous, not narrowed in front, of equal width, the sides much 

 rounded and with a distinct margin, the basilar sulcation indicated at the sides only by a small impressed 

 fovea • elytra very finely rugose and punctured, a sutural and submarginal narrow stripe obscure piceous, 

 a discoidal broader band, abbreviated before the apex, black ; this band is as broad as the intervening 

 yellow portion ; legs and underside fulvous, pubescent ; the abdomen and tarsi often fuscous. 



Hab. Panama, Volcan de Chiriqui (Champion). 



The thorax in this species is of quite a different shape from what is usually the case, 

 biol. centk.-amee., Coleopt., Vol. VI, Pt 1, June 1884. 2 S 



