BEMBIDIINVE 173 



Bates, from Panama, also belongs to this subgenus and probably 

 some others of the decribed species. 



Group III IcBtulus 

 Subgenus Tachysalia nov. 



The form of the body in this subgenus is quite different from that 

 observable in either of the two preceding, the elytra being long and 

 parallel and the prothorax transverse; the elytra have the micro- 

 reticulation characterizing sellatits, but the anterior parts are only 

 obsoletely reticulate and, in the Mexican longuhis of Bates, even the 

 elytral reticulation becomes feeble. The prothorax differs also 

 from that of the preceding, in having a distinct though short carina 

 at the basal angles, as in most of the genus Bembidion. In general 

 facies Tachysalia reminds us of some minute Bradycellids. As in 

 the two preceding, sexual modifications of the anterior tarsi are 

 slight. The type may be described as follows: 



Form elongate, parallel, moderately convex, shining, the elytra feebly 

 alutaceous, testaceous in color, the elytra with a large dusky oblong 

 common cloud, tending to expand only slightly behind; head fully 

 three-fourths as wide as the prothorax, with well developed and prom- 

 inent eyes, the sulci moderate, the larger orbital puncture feeble; 

 antennae notably short, barely longer than the head and prothorax, 

 gradually incrassate distally, the medial joints one-half longer than 

 wide; prothorax two-fifths wider than long, widest at apical third; 

 base slightly narrower than the subtruncate apex and more than 

 four-fifths the maximum width; sides narrowly explanato-reflexed, 

 moderately rounded anteriorly, oblique in more than basal half, 

 becoming broadly sinuate basally, the angles right; anterior, impres- 

 sion nearly obsolete, the posterior an entire punctate shallow sulcus, 

 before the broad feeble basal bead, the foveae rounded, moderately 

 deep; elytra two-thirds longer than wide, two-fifths wider than the 

 prothorax, almost twice as long as the head and prothorax, parallel, 

 with almost straight sides and obtusely rounded apex, the humeri 

 circularly rounded to the thoracic base; marginal gutter deep, with 

 moderate foveae; striae fine, entire, the intervals nearly flat; punctures 

 very fine, shallow and close-set; foveae at one-fourth and three-fifths. 

 Length (d" 9 ) 2.6-2.65 nim.; width 0.83 mm. Arizona (near Ben- 

 son), Dunn laetulus Lee. 



The Mexican longulus Bates, resembles Icetulus very closely in 

 outline, but the disk of the pronotum, sometimes narrowly divided, 

 is black, and the oblong black elytral spot is dilated posteriorly to 

 the marginal gutter; the strial punctures are less fine and not so 

 close-set. 



