44 MEMOIRS ON THE COLEOPTERA 



tarsi as in the preceding group. Length 5.7-6.8 mm.; width 3.5- 



4.2 mm. Arizona (Gila River Valley) gilae Lee. 



A Similar to the preceding but more narrowly oval, the dark areas 

 still more restricted and paler brown, without metallic lustre 

 or only feebly and partially greenish-metallic, the prothorax 

 with the sides evidently less converging from base to apex, the 

 elytra less abbreviated, being very nearly as long as wide, the 

 striae very fine and feeble, with moderate and widely spaced 

 punctures and flat intervals internally, the striae a little coarser, 

 more approximate, rather coarsely and closely punctate and with 

 feebly convex intervals laterally. Length 5.7-6.5 mm.; width 



3.5-3.8 mm. Utah pallidum Csy. 



B Similar to gilce in its short and very broad form but less convex, the 

 dark areas of similar extent and disposition but bright metallic 

 green throughout, the prothorax as in gilce but shorter and more 

 transverse, two and one-half times as wide as long, much more 

 sparsely, less coarsely and more unequally punctate, the green 

 median bar extended laterally in only a very feeble brown tint, 

 the median line similarly dusky; elytra much shorter than wide, 

 more broadly obtuse at apex, the striae internally very fine and 

 feebly impressed, with rather small and widely separated punc- 

 tures and flat intervals, or, externally, closer, coarser and deeper, 

 more coarsely and less distantly punctate and with convex 

 intervals, these characters however less noticeable than in gilce; 

 rhomboidal subapical spot on the suture obsolescent. Length 

 6.2 mm.; width 3.9 mm. Arizona (locality not recorded). 



pimalis n. subsp. 



Lacustre and texanum are rather closely related, but the latter is 

 more inflated, more deeply striate, with more convex intervals and 

 more converging sides of the prothorax; they belong to the amer- 

 icanum group, but are very much broader in outline than that 

 species. 



A list of all our species, embodying the above conclusions, would 

 be as follows: 



labiatum Fabr. dentatum Lee. 



nitidum Lee. solidum Csy. 



americanum Dej. frater Csy. 



iridescens Csy. gemma Csy. 



lacustre Csy. obliteratum Horn. 



texanum Csy. ssp. sonorae Csy. 



fontinale Csy. ssp. utense Csy. 



ovale Horn. ssp. subimpressum Csy. 



concinnum Csy. gilae Lee. 



tessellatum Say. ssp. pallidum Csy. 



ssp. ellipticum Csy. ssp. pimale Csy. 



grossum Csy. robustum Horn. 



brevipenne Csy. 



