from the Galapagos Islands. 33 



Mandibles short and obtuse, bidentate at the extremity, and 

 hidden by the clypeus, when the head is viewed from above. 



Mentum small, ovate, concave externally. 



Maxillary palpi moderate ; the terminal joint securiform : labial 

 palpi short ; the terminal joint swollen. 



Head considerably narrower than the thorax ; the visible portion 

 broader than long ; the fore-part in front of the eyes forms 

 nearly a semicircle, but is emarginated in front ; no indentation 

 marks the posterior or lateral boundaries of the clypeus : the 

 lateral ridge of the head, which protects the basal portion of 

 the antennae, is well-developed, and runs backwards so as to 

 divide the eye into two parts ; the upper portion of the eye is 

 rather large and round, or very nearly so ; the lower portion is 

 nearly of equal size with the upper, and also nearly round. 



AntenntE moderate ; if extended backwards would reach the base 

 of the thorax ; the joints of a shortish obconic form ; the se- 

 cond joint short ; the third nearly as long as the two following 

 taken together ; the last three joints incrassated, and fully as 

 broad as long ; the terminal joint is rounds and as large as the 

 penultimate. 



Thorax subquadrate, but little broader than long, emarginated in 

 front, and with the anterior angles rather prominent and some- 

 what acute ; the sides are indistinctly rounded, and the hinder 

 part is but little broader than the front ; the posterior margin 

 is distinctly bisinuated, and the posterior angles are right 

 angles, or somewhat acute : the surface is moderately convex, 

 and there is a distinct impressed line running parallel with, and 

 close to, both the lateral and posterior margins. 



Scutellum distinct, triangular. 



Elytra soldered together, oblong, convex, rounded at the extre- 

 mity : the humeral angles nearly right angles, but somewhat 

 obtuse, and presenting a slightly concave triangular surface in 

 front, against which the thoracic angles are applied. 



Prasternum rather contracted, pointed behind, and but httle pro- 

 duced beyond the coxae of the anterior legs. 



Abdomen with the penultimate segment very narrow in the antero- 

 posterior direction ; the last segment semicircular and depressed, 

 or concave, in the middle. 



Leffs moderate ; the tibiae straight, very little compressed, and but 

 slightly dilated at the apex : the four anterior tarsi dilated in 

 the male sex, the anterior pair distinctly so, the width of the 

 second or third joint being nearly equal to the length of the 

 four basal joints taken together ; the first and fourth joints are 

 small, the second and third equal or very nearly so ; the three 

 basal joints only appear to be covered with the velvet-Hke sub- 

 stance beneath : the middle pair of tarsi are less distinctly di- 



Ann. §• Mag. N. Hist. Vol. xvi, D 



