268 PHYTOPHAGA. 



Head smooth, impunctate, the frontal tubercles elongate and not well limited posteriorly ; carina short, rather 

 blunt; labrum piceous ; antenna half the length of the body, the first joint metallic violaceous, third and 

 fourth joints of equal length, distinctly longer than the second ; the following joints gradually widened and 

 covered with rather long pubescence ; thorax much broader than long, the sides rounded at the middle, 

 angles acute, the anterior ones thickened ; posterior margin slightly produced at the middle ; surface smooth, 

 impunctate ; the basal groove deep, slightly sinuate, and limited laterally by a deep longitudinal groove, 

 beyond which the transverse one extends some distance upwards near the lateral margin when the insect 

 is seen in certain lights ; elytra with the base distinctly raised and deeply depressed below the latter, 

 rather strongly, regularly, and closely punctate- striate to beyond the middle, from there to the apex 

 impunctate ; the basal margin is also narrowly raised and accompanied by a row of deep punctures. 



Hah. Guatemala, Purula, San Geronimo, Senahu, Tamahu, Cahabon, San Juan in 

 Vera Paz; Panama, Volcan de Chiriqui (Champion). 



9. Diphaulaca brevicollis. 



Oblong-ovate, subparallel, rufous ; antennae (the two basal joints excepted) and tarsi piceous ; thorax short, 

 very transverse ; elytra violaceous blue, without basal elevation, closely and semiregularly punctate- 

 striate. 



Length 2 lines. 



Head impunctate, with a deep fovea in front of each eye ; frontal tubercles very small and indistinct ; labrum 

 fulvous without punctures ; antennas half the length of the body, two lower joints rufous, the rest 

 black ; third and fourth joints scarcely longer than the second, rest of the joints also rather short ; thorax 

 nearly three times as broad as long, all the margins straight, the anterior angles acute but not produced ; 

 surface impunctate ; the basal sulcation deep and rather closely approached to the posterior margin ; 

 scutellum broad, fulvous; elytra not widened behind, without any basal elevation or depression, closely 

 and rather strongly punctate-striate, the apex nearly impunctate. 



Hob. Panama, Volcan de Chiriqui (Champion). 



From all the other described species the present one will be readily known by its 

 transverse thorax, which is as wide as the elytra, the comparative length of the joints 

 of the antennae, and their colour. One specimen only is before me. 



10. Diphaulaca quadraticollis. 



Greenish black below, metallic green above ; antennas black, long ; thorax square-shaped, impunctate ; elytra 

 regularly and strongly punctate-striate. 



Length 1J line. 



Head impunctate, with an impressed line round the inner margin of the eyes ; frontal tubercles rather flat- 

 tened, with a fovea dividing them ; carina very short and indistinct ; antennas two thirds the length of 

 the body, black, the first joint metallic greenish; third and fourth joints of equal length and double the 

 length of the second ; thorax nearly square-shaped, widened at the sides before the middle, the angles 

 acute and produced in a short tooth ; surface much swollen in front of the basal groove, the latter deep 

 and of usual shape ; elytra with the base scarcely raised, strongly and regularly punctate-striate, espe- 

 cially anteriorly and laterally, the punctuation less strongly but still distinctly visible at the apex ; tarsi 

 biack. 



Hah. Panama, Volcan de Chiriqui (Champion). 



I am somewhat doubtful whether this species, of which I have but one specimen to 

 compare, is not a variety of D. hilaris, Har., to which, at all events, it is very closely 

 allied. The antennae in the latter insect are, however, more elongate and slender, and 



