222 AMERICAN COLEOPTERA 



It is known to me from various localities along the coast from 

 New Jersey to Florida, and from -Brownsville and Pt. Isabel, Texas 

 (Wickham). 



31. T. vi I tiger Lee. (Plate VI, fig. 7). — Form elongate, depressed. Color 

 dark piceous or black, shining, the elytra, in typical examples, with a pale 

 Longitudinal vitta, which extends from near the humerus almost to apex, and is 

 usually suddenly narrowed about one-fourth from base, in others reduced to a 

 subhumeral spot or even entirely wanting, while in the form marginellus the vitta 

 is very broad, extending from the third stria nearly to the margin. Head as 

 wide as the thorax at apex ; frontal grooves distinct, extending posteriorly to the 

 middle of the eye; eyes large, prominent: antennae less than one-half the length 

 of the body, fuscous, the basal joints paler; palpi rufous, darker towards the tip. 

 Prothorax subquadrate, rather more than one-half wider than long, slightly nar- 

 rower at base than apex ; apex truncate: anterior transverse impression obsolete, 

 the posterior deep, finely punctulate ; median line distinct, abbreviated before 

 and behind ; basal impressions small, deep ; base truncate; sides with the margin 

 very narrowly reflexed, arcuate, sinuate in front of the hind angles, which are 

 rectangular and not carinate. Elytra slightly wider than the thorax, elongate, 

 subparallel; strife im punctate, the sutural deep, second and third very fine, the 

 latter often nearly obsolete, fourth rarely discernable; first dorsal puncture 

 about the middle, the second at the tip of the recurved portion of the sutural 

 stria; intervals flat. Body beiieath nearly black, shining. Legs yellowish tes- 

 taceous. Length .09-. 12 inch ; 2.25-3 mm. 



As indicated above, this species varies greatly in color, the form 

 described as marginellus by LeConte being at first sight very dis- 

 tinct from that in which the elytral vitta is entirely wanting, but in 

 a large series all intergrades occur. 



It resembles quite closely T. corax, the two being very often con- 

 fused in collections. From the latter species it may be distinguished 

 by the thorax squarely truncate at base, with the sides sinuate in 

 front of the hind angles, which are rectangular. The second dorsal 

 puncture of the elytra is always situated at the tip of the recurved 

 portion of the sutural stria, not between it and the apex as in corax. 



It occurs along the Pacific Coast from California to Vancouver 

 Island. The form marginellus was described by LeConte from the 

 Valley of the Colorado River, about thirty miles from the sea. 



32. T. corax Lee. — Form depressed. Color black or dark piceous, shining, 

 the elytra sometimes with a pale longitudinal vitta, usually less clearly defined 

 than in vittiger, very finely or scarcely perceptibly alutaceous. Head as wide as 

 the thorax at apex ; frontal grooves distinct, extending posteriorly as far as the 

 middle of the eye; eyes large, prominent; antennse less than one-half the length 

 of the body, piceous, the basal joints somewhat paler; palpi piceous. Prothorax 

 about one-half wider than long, very slightly narrower at base than apex; apex 

 truncate ; anterior transverse impression obsolete, the posterior distinct, close to 



