148 GEO. II. HORN, M. D. 



convex, median line finely impressed, surface often slightly wrinkled and with 

 a few punctures near the hind angles. Elytra oblong, stria? fine and obsoletely 

 punctulate, intervals usually flat and sparsely punctulate, the dorsal punctures as 

 in limbata. Body beneath piceous, smooth. Length .36 — .44 inch; 9 — 11 mm. 



Sexual characters as in limbata. 



The convexity of the elytral intervals in the preceding species and 

 their flatness in this are not strictly accurate characters for distinguishing 

 the two, as specimens occasionally occur which belong unmistakably to 

 the present species in which the intervals are slightly convex. It seems 

 probable that Planesus fuscicollis Motsch., should be referred to the 

 present rather than the preceding species. 



Occurs with the preceding species. 



P. pimctigera. Lee. — Brownish piceous, feebly shining. Head sparsely 

 punctate, a few wrinkles over the eyes. Thorax one-third broader than long, 

 distinctly narrowed at base, hind angles rectangular, margin rather narrow but 

 wider posteriorly and more reflexed, disc slightly convex, median line finely 

 impressed from base to apex, surface obsoletely wrinkled and sparsely punctulate. 

 Elytra oblong-oval, with fine strise, obsoletely punctulate, the intervals slightly 

 convex near the base, flat posteriorly and sparsely punctulate, dorsal punctures as 

 in limbata. Body beneath smooth and with the legs rufo-piceous. Length .38 — 

 .40 inch; 9.5 — 10 mm. 



Sexual characters as in limbata. 



This species resembles some of the paler forms of platicollis but 

 has the hind angles of the thorax more distinct and the surface more 

 wrinkled and punctulate. 



Occurs near Fort Yuma, California, and in Arizona. 



P. Slileipt'ililis n. sp. — Piceous, very slightly shining. Head irregularly 

 rugose on the front, vertex sparsely punctate. Antennas piceous. Thorax about 

 as long as wide, sides moderately arcuate, slightly sinuate posteriorly, hind angles 

 acute slightly prominent, margin narrowly reflexed in front, a little wider pos- 

 teriorly, disc moderately convex, median line distinctly impressed but not entire, 

 subapical impression distinct, surface nearly smooth. Elytra oblong-oval, rather 

 deeply striate, the strise not punctured, intervals convex in their entire length 

 and without punctures, dorsal punctures very small, placed as in limbata. Body 

 beneath piceous, smooth. Legs rufo-piceous. Length .40 inch ; 10 mm. 



Male. — Tarsal characters as in limbata. Anal segment with but one puncture 

 each side. 



This species appears related to P. basipunctata Chd. found in Mexico, 

 but seems distinct by the elytral sculpture. 



I have seen but one specimen, collected in the Peninsula of California 

 by the late W. M. Gabb. 



P. semisulcata n. sp. — Piceous, feebly shining. Head sparsely punctate, 

 slightly wrinkled above the eyes. Antennae rufo-piceous. Thorax one-third wider 

 than long, sides moderately arcuate, slightly sinuate posteriorly, the hind angles 

 distinct and slightly prominent, margin very narrowly reflexed in front, a little 



