338 PROCEEDINGS OF THE ACADEMY OP Diabrotica (Chevr.) Er. D.? in sol it a, supra sordide flava, thorace latitudine duplo breviore, apice eubsinuato angulis anticis prorhinulis, basi emarginato angulis obtusis subro-tund itis, lateribus anguste margir.atis, elytris thorace latioribus oblongis, con-fertim puncatis, gutta posthurnerali, alteraque discoidali pone medium, nigris ornatis, scutello nigro ; subtus niger, abdominis segmentis flavo-piceo ma.gin-atis, femoribus flavis palpis antennisque nigris, his thorace elytrisque baud brevicribus. Mas alatus abdomine elytris haud longiore. Long. *23. Femina aptera, abdomine iuflato. elytris plus duplo longiore. Long. -46. Cape San Lucas. The difference in size between the sexes is produced en-tirely by the abdomen of tbe female being immensely distended. The first joint of the antennas is sometimes piceous, and the head has sometimes a short black occipital line. The thorax is moderately convex, with a slight impression at the middle, and another at the base; there is also a faint transverse impres-sion before the middle. The second and third joints of the antennas are together equal to the fourth. It is extraordinary to find the genera of the Pacific coast of most diverse families in which the abdomen of one or both sexes is imperfectly covered by the elytra, and the wings wanting, thus unexpectedly increased by a Cbysome-lide. There does not appear to me any sufficient reason for separating the pre-sent species from Diabrotica, though I have not as yet studied the group to which it belongs sufficiently to entitle my opinion to much weight. New species of COLEOPTERA inhabiting the Pacific district of the United States. BY JOHN L. LECONTE, M. D. The species described in the present paper have been derived partly from contributions of friends, partly from Government expeditions. Those from the Northwestern Boundary Commission were made by Mr. George Gibbs, and the late Dr. Kennerley ; those from Lieut. Mullan's Wagon Road Expe-dition were collected by Mr. John Pearsall, and have been submitted to me by the Smithsonian Institution. It is much to be regretted that the most valuable portion of the last mentioned collection, procured within the moun-tainous region at the head of the Missouri river, has in great part been rendered by the collector unavailable for scientific research ; the restrictions placed upon investigations by the Entomological Society of Philadelphia, now in possession of the larger part of the collection, being such as to render any satisfactory comparisons extremely difficult. I must return my cordial acknowledgements to Mr. Andrew Murray, now of London, for the liberality with which he has given specimens, many in-deed unique, in aid of my investigations ; and also to Mr. Alex. Agassiz, for ex-cellent collections made at San Mateo, Mendocino City, and on the Gulf of Georgia ; and to Mr. C. M. Bache, U. S. Coast Survey, for a good series of spe-cies from the islands of Santa Barbara and Sauta Cruz ; and likewise to Mr. G. Davidson, U. S. Coast Survey, for his continued efforts in supplying speci-mens from California. 1. Cicindela longilabris Say. A beautiful green variety of this species was found at Kootenay Camp ; a similar variety has been found in Newfound-land. 2. Cicindela m o n t a n a, atra, labro magno, antice obtuse dentato, lateribus sinuato, thorace transverso, trapezoideo, modice convexo, confertim rugoso, impressionibus profundis, elytris nitidis, confertim punctatis, fascia trans-[Nov.