AMERICAN COLEOPTERA. 33 



side of the base of the raentum, similar in form to Amhl^chila, but 

 with the terminal piece of the inner lobe relatively longer and 

 the palpi with joints one and three equal in length, the second 

 joint shorter. 



Mentum consists of a small triangular basal piece from which 

 arise two coriaceous processes or basal supports of the palpi which 

 are two jointed, relatively longer than in AmhlycMla, first joint 

 stout armed with strong spines at tip, second joint more slender 

 and slightly longer. 



Prothorax semi-corneous, nearly exactly semicircular, apex feebly 

 bisinuate, angles acute, disc feebly convex, margins narrowly reflexed, 

 surface moderately shining, median line finely impressed, a transverse, 

 slightly oblique impression in front of middle and with setae along 

 the apical margin, two at middle of disc, and feebly fimbriate along 

 the margins. 



Mesothorax half as wide as prothorax, feebly semi-corneous, one- 

 half wider than long, sides parallel and straight, apex very suddenly 

 narrowed. 



Metathorax very little wider than the mesothorax, sides obtusely 

 angulate. 



Abdomen. — Segments 1 — 4 gradually longer, otherwise similar in 

 form, each with two semi-corneous plates on the dorsal ftice, and four 

 on the ventral aspect feebly marked ; sides of segments with two 

 feebly semi-corneous plates in the connecting membrane which is 

 deeply wrinkled forming vaguely two channels which extend from 

 the metathorax to the tip of the abdomen. Fifth ventral more 

 gibbous posteriorly and longer than the preceding segments, and 

 with the usual plates and with two hooks on each side directed 

 anteriorly, the outer hook longer, both stout at base and suddenly 

 more slender at tip; posteriorly to the hooks are numerous fine 

 spinules. The next three segments are gradually narrower. The 

 nintb segment is more decidedly corneous. The anal segment is sub- 

 conical, apical margin crenulate, anal opening ventral. 



Spiracles are as in AmhIi/diUa. 



Legs are as in AmhlycMla. 



The general aspect of this larva is intermediate between that of 

 Cicindela and Amblychila the more striking points of difference will 

 be indicated hereafter in a tabular form. 



For the privilege of studying this larva I am indebted to Dr. H. 

 Hagen of the Museum of Comparative Zoology at Cambridge. 



TRANS. AMER. ENT. SOC. Til. (5) JANUARY, 1878. 



