284 BULLETIN G3, UNITED STATES NATIONAL MUSEUM. 



A series of latieollis from St. Nicholas Island is almost distinctive 

 of another race {forma instdaris) or insular form. The pronotum is 

 notably bright and shining, and the general form is leather more 

 elongate!}' robust. 



General observations. — The middle lobe of the mentum is moderate 

 and subj^arabolic or subtrapezoidal in outline; the surface is very 

 feebly convex and coarsely punctate, rarely feebly foveate laterally. 



The prosternum is but moderately prominent ventrally with the 

 coxa\ evenly arcuate antero-posteriorly and mucronate behind, or 

 subhorizontal with the tip mucronate; frequently deeply and longi- 

 tudinally grooved between the coxae. 



The mesosternum is more or less arcuately declivous and more or 

 less broadly concave. 



The abdominal intercoxal salient is quite quadrate and in width is 

 a little shorter than the third segment ; the post-coxal part of the 

 first is a little hunger than the third; the second twice as long as the 

 fourth, and the third is a third of its length shorter than the second. 



The abdominal process is about a fourth of its width wider than 

 the metasternal salient. 



The metasternum laterally between the coxa? is quite short and in 

 length is about equal to the width of a mesotibia at middle. 



The tibial grooves of the femora are well developed, and the mar- 

 gins are quite cariniform; the floors are quite flat, opaque, and fre- 

 quently slightly granular, especially on the meso- and metafemora. 



The profemoral grooves are subentire, the margins slightly evanes- 

 cent before the base, and the anterior margins are dentately laminate 

 near the outer third. The mesofemoral grooves are evanescent at 

 basal fourth,' those of the metafemora at basal third. 



The external surface of the protibia? is more or less distinctly cari- 

 nate and the tarsal grooves are more or less evident, sometimes feebly 

 glabrous toward apex, but generally scabrous; the articular cavities 

 are not strongly closed. 



The meso- and metatibise have the articular cavities strongly closed 

 and margined; the tibia? are not carinate. Externally both have the 

 grooves evident in apical two-thirds, with rest of the surface very 

 densely, strongly, and niiii-icately sculptured. 



The tarsi are quite stout. The protarsi are about two-sevenths of 

 their length shorter than a mesotarsus. Joints two, three, and four 

 are subequal and slighth^ wider than long, together about ecjual to the 

 fifth ; first joint about as long as wide. 



The mesotarsi are about a ninth of their h-ngth shorter than a meta- 

 tarsus. Joints tAvo, three, and four are sube(]ual and about as h)ng as 

 wide, together longer than the fifth; the first is about one aud a half 

 times longer than wide. 



