366 Field Museum of Natural History — Zoology, Vol. VII. 



Xenoclerus edwardsii Horn. 



Trogodendron Edwardsii Horn, Trans. Amer. Ent. Soc, viii. 1880, 



p. 149- 



This is one of our largest Clerids, the size ranging from 15 to 19 

 milHmeters. It occurs at El Chinche (2,000 ft. el.), Lower California 

 (Horn), in San Diego County, California, (Fall, Fuchs), and the 

 writer has before him specimens from Bill Williams Fork, Arizona 

 (Snow), and Tucson, Arizona, (Wickham) both of which were taken 

 in August. The Tucson specimen is the largest that the author has 

 seen; the sides of the ventral abdominal segments are broadly red, 

 the apical segments entirely red. The black elytral markings are 

 quite variable in extent but the fascia is always well before the middle, 

 not median as stated in the original description. 



Mr. Schenkling (Bull. Mus. Hist. Nat. Paris, 1902, p. 327), has 

 erected the genus Xenoclerus for the above American species, Tro- 

 godendron being retained for the Australian species. 



In Trogodendron the anterior half of the elytra is covered with 

 large, profound, seriate punctures. In Xenoclerus the same part is 

 finely, irregularly punctate, posteriorly the punctures are closer but 

 still very fine, the humeri are elevated but the subbasal gibbosities 

 (which are very distinct in Trogodendron) do not exist; the thorax 

 is not granulate, but smooth and shining, sparsely, fineh^ but deeply 

 punctate; the anterior transverse line is strongly marked; a rather 

 feeble fovea each side of disk; the antennae are less stout, the fourth 

 to tenth joints are not dentate, the eleventh joint pyrifonn, the inner 

 margin not straight but arcuately excavated; and the posterior 

 femora do not attain the apex of the elytra or abdomen. 



Xenoclerus is said to have the second joint of the antenna.* not 

 globular but nearly as long as the third joint, and the tarsal claws 

 thickened and obtusely dentate at the middle. The writer is unable 

 after examining several specimens of the typical species of Trogo- 

 dendron (fasciaculatum, Schreib.), and two specimens of X. edwardsii, 

 to find any difference of moment in the structure of these parts; 

 the claws are obtusely toothed in both genera, not at the middle but 

 near the base, and the second joint of the antennae in Xenoclerus is 

 much shorter than the third joint and subglobular in form. 



TrichodeA Herbst. 



Dr. (Jcorge H. Horn in his synopsis of the species of Trichodrs 

 (Trans. Amcr. Knt. Soc, v, 1876, pp 231-232) recognized six species, 

 including illustris which was then first made known, as occurring 



