46 Mr. G. C. Champion's Revision of the Mexican 



towards the tip, two stout hooks projecting from the internal sac, 

 the latter, when seen evaginated, armed with various sharp back- 

 wardly-directed spines (figs. 12, 12a). 



Hab. Mexico, Durango, Vera Cruz, Oaxaca ; Guate- 

 mala ; Costa Kica ; Panama ; Colombia, Pasto. 



A common insect in Guatemala and Panama, separable 

 from D. plicafum by its more shining surface, and the 

 testaceous femora and tibiae ; the suture and outer margin 

 of the elytra are frequently flavescent, and the pallid 

 humeral streak is often continued as a narrow oblique 

 stripe down the disc. Gorham described the prothorax 

 as bright red, but not one of the long series before me 

 shows this coloration. The three examples from Juquila 

 in Oaxaca {(^ $) are larger than the rest. Five males have 

 been dissected. The aedeagus is very similar to that of 

 D. plicatum. 



35. Discodon chiriquense. 



Discodon photinoides, Gorh., Biol. Centr.-Am., Coleopt. iii, 



2, p. 288 {nee p. 84). 

 Discodon triste, Gorh., loc. cit. pp. 82, 287 (part.). 

 $. Discodon chiriquense, Pic, Melanges exot.-entom., fasc. ii, 



pp. 14, 15 (Feb. 1912). 



Narrow ((J), broader ($), opaque, the head and prothorax shining, 

 finely pubescent; nigro-fuscous or black, the anterior margin of 

 the head, the base of the mandibles, the prothorax (a triangular 

 patch of variable extent, sometimes extending to near the margin, 

 excepted), the explanate outer margin of the elytra, and often the 

 suture also, flavous, the humeri, the femora and tibiae in part, 

 and the last ventral segment testaceous in some specimens. Eyes 

 rather small in both sexes. Antennae widened, serrate, tapering 

 outwards, very long in cj, short in $. Prothorax transverse ; narrow, 

 subquadrate, and with a narrow, deep notch on each side just behind 

 the middle ; very broad, widely and abruptly explanate, and with 

 the sides rounded and not or scarcely sinuate in $. Elytra in (^ 

 about as wide as, and in $ narrower than, the prothorax at the base, 

 moderately explanate from a little below the shoulder. Inner claw 

 of anterior tarsi broadly lobed, and outer claw of the other tarsi 

 cleft at the tip, in (J. 



Var. ? Elytra wholly black. S ?• 



Q. Eighth ventral segment cleft at the tip, appearing broadly 

 bilobed ; the evaginated internal sac, as seen from the dorsal aspect 

 of the ninth segment, disclosing a long, slender, curved flagellum, 



I 



