﻿MELOLONTHIDiE OF THE UNITED STATES. 261 



Mexican Boundary survey. The club of the antennae is nearly twice as long as the 

 stem ; the abdomen is without impression ; the spurs of the posterior tibiae are free, 

 long, flattened and obtuse. 



Group XV. (D). 



Contains some of the smallest species of the genus ; they are of an oblong elongate 

 form, with the upper surface, at least of the thorax and base of the elytra, pilose with 

 long hairs. The head is small, the clypeus concave, broadly margined, and rounded. 

 The tips of the mandibles are not visible in a state of repose ; the last joint of the 

 maxillary palpi is slightly oval and has an impression on the outer face. The thorax 

 is slightly narrowed at the base. The last segment of the abdomen is short, though 

 not so very short as in the groups XII, XIII, and XIV. The spurs of the posterior 

 tibiae of both sexes are free, long flattened and obtuse, though slender. On account 

 of the small size of the mandibles the first species of the group was considered as a 

 distinct genus Trichesthes by Erichson,. but Lacordaire, considering it as established 

 upon insufficient grounds, has properly as I think, suppressed it. Burmeister retains 

 it in his work on Lamellicornia, but with an addition of species which renders it 

 unrecognizable. 



54. L. tristis, testaeea, elongato-oblonga, eapite thoraceque saturatioribus, dense grosse punctatis, longe 

 pilosis, clypeo integro concavo, thorace postice subangustato elytris confertim punctatis, haud costatis, 

 breviter pilosis, pilis longis versus basin raris intermixtis, margine longe fimbriate, pectore longe 

 dense villoso. Long. -47 — -56. 



Melolontha tristis Fabr. Syst. El. 2,168. 



Melolontha pilosicollis Knoch, Neue Beytr. 85, tab. 3, fig. 29. Say, Jour. Acad. Nat. Sc. Phil. 3, 243. 



Harris, Ins. Mass. Inj. Veg. 2nd ed. 28... 



Trichesthes pilosicollis Er. Ins. Deutchl. 3, 658. 



Trichestes tristis Blanch. Cat. Col. Mus. Paris, 141 : Burm. Lamell. 2nd, 358. 



Middle and Southern States, abundant. In the male the club of the antennae is 

 longer than the stem, the middle of the abdomen is broadly concave, the penultimate 

 segment has an acute transverse crest at the middle, and the margins of the last seg- 

 ment are slightly elevated. 



55. L. c r i n i t a , elongata, testaeea, fortiter punctata, clypeo concavo rotundato, eapite thoraceque rufes- 



centibus, hoc postice angustato, longe villosis, elytris breviter pubescentibus, pilis longis paucis versus 

 basin interrnixtis, margine fimbriate ; pectore longe dense villoso. Long. -5. 

 ? Trichestes crinita Burm. Lamell. 2, 2nd, 358. 



Texas, Mr. H. Haldeman. This species agrees with the preceding in sculpture and 

 appearance, but the body is longer, cylindrical in the male, slightly ovate in the 

 female ; the thorax is more narrowed behind, and the hairs of the elytra are shorter : 

 the latter character is noticed by Burmeister but the former is omitted. The sexual 

 characters are precisely the same. 



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