14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



punctured, apex rounded and lipped. Anterior tibia with three teeth, 

 the upper not strongly developed. Second segment of anterior tarsus 

 elongate with parallel sides, about four times as long as wide. Aedea- 

 gus, figure 5. 



Female. — Antennal club a little shorter than second to seventh 

 segments combined. First to fifth sternites unmodified, sixth sternite 

 convex, with a broad shallow emargination behind. Pygidium strongly 

 convex in basal half, shallowly and transversely excavated apically, 

 with a single, low, median callosity. Anterior tibia strongly tridentate. 

 Second segment of anterior tarsus elongate, parallel-sided, about three 

 times as long as wide. 



Length. — 11 to 13.8 mm. 



Type locality. — Texas. 



Types. — In the Academy of Natural Sciences, Philadelphia (vexatiis 

 Horn) ; in the United States National Museum, no. 574 (cavifrons 

 Linell). 



Material examined. — One female from Texas in the Philadelphia 

 Academy (type of vexatiis Horn) ; two males and one female from 

 Brownsville, Tex., May 24-June 11, C. H. T. Townsend (type and 

 paratypes of cavifrons Linell) ; five males and one female from same 

 locality. May 15-Aug. 17, C. SchaefTer (Brooklyn Museum Collection, 

 U.S.Nat.Mus.) ; one male from Texas, Fry Collection 1905-100 

 (British Museum). 



This species is unusual in the genus in having a moderately well 

 defined third tooth on the anterior tibia of the male. 



CHLAENOBIA VEXATA subsp. UNITUBERCULATA Bates 



Chlaenohia unitubcrciilata Bates, 1889, Biol. Centr.-Ainer., Coleopt., vol. 2, pt. 2. 

 supplement, p. 399. 



Very similar to the typical form of the species. The punctation of 

 the head and pronotum is a little coarser in unituberculata than in 

 cavifrons. The aedeagus offers the only sure means of identification. 

 In the present subspecies (fig. 6) the apical portion of the organ 

 narrows sharply from a point at about the level of the terminus of 

 the median fissure. 



Type locality. — Temax, N. Yucatan (Gaumer). 



Type. — In the British Museuin. 



Material examined. — A pair, probably paratypes, from the type 

 locality, loaned for study by the British Museum and a pair from 

 Rin Antonio, Oaxaca, Mexico, F. Knab, collector. 



