CHAULIOGNATHUS. 69 
Hab. Mexico, Capulalpam (Sad/é) ; Guaremata, Purula, Sabo (Champion). 
Allied to C. heros, Guérin, from which it differs in being larger in average size, rather 
more shining ; the yellow parts are orange-red instead of pale yellow; the black portion 
of the elytra does not exceed the apical third in any of the specimens from Central 
America. The ventral portion of the abdomen is blacker; only the margins of the 
segments externally and laterally, and the apical valvular plate in the male with the 
short preceding segment (which is only present as a lobe on each side), and in the 
female the two apical segments, are yellow. The dorsal surface is yellow, whereas in 
C. heros this part is for the most part black. About a dozen specimens were taken by 
Mr. Champion. | | 
2. Chauliognathus nitidicollis. 
Niger ; prothorace elytrisque flavis, illo nitido, puncto discoidali sat magno nigro ; abdominis segmentis singulis 
marginibus lateralibus et apicalibus flavis, apice ipso flavo. Long. 18-20 millim. ¢ @. 
Hab. Costa Rica, Volcan de Irazu, Cache, Rio Sucio (Rogers). 
This species is more parallel (the elytra not being widened behind) than the last. 
The head, breast, basal six segments of the abdomen, and appendages are black, only 
the margins of the abdominal ventral plates and its apical segments being yellow. 
The thorax is very smooth and shining; it is quadrate, inclined to be transverse. 
The elytra are somewhat rounded at their apices, leaving the sutural angle open. 
3. Chauliognathus dimidiatus. (Tab. V. fig. 3.) 
Chauliognathus dimidiatus, C. Waterhouse, Trans. Ent. Soc. 1878, p. 330. 
Hab. Mexico, Cordova (Sadlé); Nicaracua, Chontales (Janson, Belt); Costa Rica, 
Volcan de Irazu (Rogers). 
The figure is taken from a male specimen from Chontales. 
This species is liable to vary in the form of the thorax, which is more oblong in some 
specimens: in one from the Volcan de Irazu the disk of the thorax is infuscate ; and in 
two males taken by Mr. Belt at Chontales the valvular apical segment of the abdomen, 
as well as the oth, is nearly black. In other specimens the abdomen is nearly black 
beneath, with the apical plate in the male yellow and very smooth and shining. 
4, Chauliognathus sodalis. (Tab. V. figg. 8, 9.) 
Chauliognathus sodalis, C. Waterhouse, Trans. Ent. Soc. 1878, p. 326°. 
Callianthia grandis (Sturm coll.). 
Hab. Mexico (Sallé), Oaxaca! (B.M..). 
The figures are from specimens from Sallé’s collection, both females ; fig. 9 represents 
the var. 2 of Mr. Waterhouse’s description. There were also specimens of his var. 1, 
taken by Sallé; but I do not observe that they differ materially in form. The abdomen 
