220 AMERICAN COLEOPTERA. 



the middle. Elytral suture just visibly shorter than the prothorax, the sides a 

 little divergent posteriorly. Abdomen at base subequal in width to the elytra, 

 the margin quite strong on the fourth segment, but very fine on the fifth. Head 

 and prothorax shining, the punctures moderate in size, distinct on the latter by 

 about their own diameters on the average, closer on the head except along the 

 median line. Elytra a little dull, very finely and sparsely punctate, the punc- 

 tures barely visible in the sutural region. Abdomen finely alutaceous and dull, 

 excessively minutely puuctulate. Length 1.5-1.6 mm. 



Described from one pair ( ^ , $ ) taken at Las Vegas in February. 



Following the characters used in Casey's table, neomexicanus 

 would stand with similis and miindulus, both of which are smaller 

 and more slender. In similis the sides of the elytra are strongly 

 divergent, the border of the fifth ventral is said to be strong and 

 the metasternum is concolorous with the remainder of the lower 

 surface. In mundulus the lateral border of both the fourth and 

 fifth segments is nearly obsolete. Both similis and mundulus occur 

 in the extreme eastern part of the country. 



Heterothops niediocris n. sp.— Testaceous, head darker. Head nar- 

 row ; eyes moderate, distance from their posterior margin to the nuchal constric- 

 tion less than twice their length; setigerous punctures of the sides of the head 

 as in occidentis, viz. — one at the middle of the upper margin of the eye, another 

 below the posterior margin of the eye, about halfway between it and the infra- 

 orbital ridge, and two others arranged transversely near the nuchal constriction. 

 Antenufe nearly as in occidentis, the third joint about two-thirds as long as the 

 second, eleventh as long as the two preceding. Form slightly stouter, but other- 

 wise nearly as in occidentis. Length 2 mm. 



Described from three closely similar examples — 2 1 's, 1 9 — 

 taken by Barber and Schwarz at Las Vegas Hot Springs, and by 

 the writer at Riverside, California 



This species is intermediate between pusio and occidentis. As 

 compared with pusio it is a little smaller and evidently less stout, 

 quite diflferent in color, with smaller eyes, and with no setigerous 

 puncture at the postero-superior margin of the latter. As conipared 

 with occidentis the form is a trifle less slender, the color is similar 

 except for the darker head of the present species, and the eyes are 

 much larger, these being abnormally small in occidentis. Tlie last 

 ventral of the male is deeply triangularly emarginate, the notch 

 nearly as deep as wide, the sides nearly straight, and with well 

 defined outer angles. 



Neoniedon piciventre n. sp. — Robust, subdepressed, reddish-brown, 

 the abdomen blackish. Head large, transversely cjuadiate behind the eyes, the 

 sides parallel, the hind angles narrowly rounded ; base sinuato-truiicate ; surface 



