274 



REVISION OF THE TENEBIUONnLE OF AMERICA, 



TRIBE IX STENOSI1NI. 



Mentura large, inserted on a gular peduncle, maxillae exposed, ligula partly visible. 

 Trochantin not visible. Coxa? moderately separated. Legs feeble, tibial spurs obsolete. 

 Tarsi ciliate. Antenmc eleven jointed. Elytra feebly embracing body. Head strongly 

 constricted behind. Eyes divided (in our species), coarsely granulated. 



One genus in our territory belongs to this tribe. 



A KyROSCHIZUS, Leo. 

 Ancoschizns, Lee, Ann. Lye. V. 138. 



It is incorrect that the; eyes have been said to be entire. They are divided by the 

 side of the head, the larger portion being enclosed between the margin and another lon- 

 gitudinal elevation, while a smaller portion, sometimes of only three or four lenses (in 

 costipennis), is visible beneath. Attention was directed to this by the discovery of a 

 second species in which one-third of the eye is below the margin of the head. 



A. costipennis, Lee, Ann. Lye. V. 188; Lao. Genera, PI. 49, flg. 4; Thomson, Arcana, PI. XIII, fig. 11. 



Occurs from Vallecito, Cal, to near Fort Cumtnings, New Mexico. 

 Figured by Lacordaire, Gen. des Colcop., pi. 49, fig. 4 (poor figure). 



A. suleieollis, light brown, head elongate oval, gradually narrowing behind the eyes, coarsely punctured, 

 each puncture bearing a yellowish scale-like hair, opistoma smoother; thorax longer than broad, smaller and narrower 

 than head, disc coarsely punctured and with yellowish scale-like hairs; slightly channelled longitudinally and with 

 two obtuse elevated ridges bounding the groove; thorax narrower behind, sides anteriorly strongly rounded, poste- 

 riorly sinuate with distinct angles, apex and base truncate; elytra elongate oval, humeral angles not distinct, with 

 lour acute costa; on each elytron, interstices Hat, with a double row of very coarse punctures; body beneath rather 

 finely punctured and with sparsely placed yellowish scales. Legs witli yellowish scale-like hairs. Length .10 inch. 



Collected in Owens' Valley, California, under stones in very dry places, and very fre- 

 quently, though probably merely accidentally, with ants. Very abundant during Spring 

 and Summer. 



Differs from all our other species by the very narrow thorax. Anteriorly the sides 

 are broadly rounded, posteriorly becoming sinuate and narrowing so that the base is one- 

 half smaller than the broadest part of the thorax. The elytra are elongate oval as in cm- 

 tipennia, the costte have a row of recumbent scale-like hairs, the interstices are usually 

 fiat, though at times faintly carinatc. The elytral eosta: are lour in number (including 

 the sutural), the first and second do not extend to the tip and are unequal in length, the 

 first being longer, the third extends from within the humeri to the apex, the fourth is 

 marginal and unites with the third near the apex. 



A. regularis, dark brown, head rotundate-oval, broadly rounded behind the eyes; thorax longer than broad, 

 scarcely narrower or smaller than the head, disc feebly channelled, anteriorly and posteriorly truncate, sides ante- 

 riorly rounded, gradually narrowing posteriorly. Elytra elongate oval, costate, interspaces Hat with a double row of 

 very coarse punctures. Length .18 inch. 



