52 MEMOIRS ON THE COLEOPTERA 



rather small and feeble, the series narrowly interrupted. Length 

 (cf 9 ) 13.0-14.0 mm.; width 5.9-6.5 mm. New York (Long Island). 



[Daptus incrassatus Dej.] incrassatus Dej. 



A Similar to the preceding but a little larger, evidently more elongate 

 and devoid of darker shading on the pronotum and elytra, ex- 

 cepting a darker medial apical margin on the former; head rela- 

 tively a little smaller; prothorax nearly similar; elytra with the 

 humeral angles still more broadly rounded; hind tibiae of the male 

 more elongate and less dilated at apex, the hind tarsi a little longer 

 and not quite so inflated. Length (cf 9 ) 14.4-16.4 mm.; width 

 6.0 6.8 mm. Iowa (Keokuk). Five examples.. . fluviaticus n. subsp. 



This forms another instance of anciently identical stocks gradu- 

 ally becoming different on opposite slopes of the Appalachian 

 system, as shown by Tetraopes tetrophthalmus and iowensis (Mem. 

 Col. IV, p. 386) and also perhaps by Cicindela levettei, when com- 

 pared with sexguttata, but in the latter case the differences have 

 become specific, as shown by the very much longer tibiae in levettei 

 as well as the constantly different coloration. 



Daptus Fisch. 



This genus includes but few isolated species, only occurring, so 

 far as known, in the palsearctic fauna, where however they are 

 widely diffused. The type of the genus, Daptus vittatus Fisch., 

 with several varieties, and pictus, of the same author, are the only 

 species now known. The body is rather small in size, oblong- 

 elongate and parallel in form, moderately convex and shining, the 

 elytra pale in color as in Geopinus and with nearly corresponding 

 darker discal parts. The head is large, the eyes moderate and 

 prominent, the mandibles well developed, arcuate at tip, the 

 labrum feebly sinuate and the frontal impressions very shallow 

 and diffuse; there is a pointed projection above the point of antennal 

 insertion and the antennae are short and rather stout but filiform, 

 with the third joint as long as the next two combined. The mentum 

 is not very large, unusually short, the sinus arcuate at the bottom 

 but not dentate, the ligula rather widely expanded at tip and 

 longer than the paraglossae, which are small in size; the palpi are 

 rather slender; the prothorax is transverse, cordate, about as wide 

 as the elytra, with the converging sides sinuate before the basal 

 angles, which are right, not rounded and even slightly reflexed; 

 the elytra are parallel, abruptly very obtuse at apex, the sinus 



