124 HETEROMERA. 
prothorax, densely and minutely punctured, with two vague costz on the disc and one close to the lateral 
margin (the inner one extending to about the middle, and the others nearly to the apex), the suture also 
a little raised, the apices separately rounded ; beneath pubescent, coloured as above, very densely punc- 
tured; legs moderately long, testaceous, the tibie and tarsi and the apices of the femora piceous, the 
extreme base of each tarsal joint testaceous. 
d. Fifth ventral segment broadly and very deeply emarginate (shallowly arcuate-emarginate in the female) ; 
the sixth ventral segment divided down the middle; the central sheath with a separate, small, accompany- 
ing spoon-shaped piece on each side. 
Length 133-16 milliim. (¢ 9.) 
Hab. Mexico (Flohr), Cordova (Sallé), Jalapa (Hoge); GuatTemaLa, Cerro Zunil 
(Champion); Costa Rica, Volcan de Irazu, Rio Sucio (Rogers). 
Many specimens. Smaller and less elongate than D. giganteus; the elytra much 
shorter in proportion, narrower, and with the apices separately rounded; the antenne 
differently coloured, and with less elongate joints, 3-5 being much shorter; the thorax 
shorter, less compressed at the sides, and more finely punctured ; the legs less elongate ; 
the fifth ventral segment emarginate in the middle in both sexes. In the male of 
D. annulicornis the head is a little broader than in the female; and the fifth ventral 
segment is as deeply emarginate as in D. armatus, but still more broadly so. A male 
specimen from Cerro Zunil is figured. 
According to Mr. Flohr, D. annulicornis is not uncommon in the temperate and 
colder regions of Mexico. 
4, Diplectrus giganteus. (Tab. VI. fig. 3, 2.) | 
Very elongate, subparallel, opaque, ochraceo-ferruginous, the head and prothorax of a more rufous tint, densely 
clothed with fine fulvous pubescence. Head closely and finely punctured, obsoletely canaliculate in the 
middle, the eyes black and rather large, the maxillary palpi and tips of the mandibles piceous ; antenne 
(2) very long and slender, the joints from the third very elongate, fusco-ferruginous, the four basal joints 
piceous, joint 2 about one-third of the length of 3, 3 much longer than 4; prothorax narrow, longer than 
broad, compressed at the sides behind the middle, the latter moderately rounded in front and strongly 
constricted behind, the hind angles prominent, the base and apex somewhat rounded and rather strongly 
margined, the disc with a large shallow triangular depression in the middle in front and a transverse one 
before the base and with traces of a smooth raised median ridge, the surface densely and very finely 
punctured, the punctuation becoming scabrous in places; elytra very long, broad, fully twice as wide as 
the prothorax, very minutely and densely punctured, with two vague costee on the disc and one close to 
the lateral margin (the inner one extending to about the middle and the others nearly to the apex), the 
suture also a little rounded, the apices together rounded; beneath pubescent, testaceous, very densely 
punctured, the metasternum smoother in the middle; legs very long, testaceous, the tibie and tarsi and 
_ the apices of the femora piceous; fifth ventral segment (9) broadly rounded. 
Length 233 millim. (¢.) 
Hab. Costa Rica, Rio Sucio (Rogers). 
One female example. Larger than D. armatus; the thorax compressed at the sides, 
longer, depressed in front, and more densely and more finely punctured, the punctuation 
becoming scabrous in places; the elytra relatively broader, with the apices rounded 
‘ together (not separately and with the sutural angle rounded as in D. armatus), and of 
a browner tint. 
