NATURAL SCIENCES OF PHILADELPHIA. 75 



versuni truncatum ; clypeus brevis membraneus ; tarsi antici 5-artieulati, 

 maris haud dilatati : abdomen articulis totis corneis, vel medio membraneis : 

 caput breve. 



A genus also intermediate between Malacbius and Anthocomus, agreeing 

 with "the first in the position of the antennae, with the second by the membran- 

 ous clypeus. Besides the species here described, I refer to this genus Malacbius 

 auritus Lee, (Proc. Acad. Nat. Sc. 6, 165,) which differs by the antennae 

 being serrate in both sexes and by the ventral segments of the abdomen being 

 corneous. In the species here made known, all the segments except the last 

 have a wide medial membranous portion. 



57. H. mirandus, elongatus, parallelus, capite viridiseneo, subtilissime 

 punctulato et pubescente, thorace latitudine breviore, fiavo, macula magna 

 nigra a basi fere ad apicem extensa, elytris opacis rugosis flavis, sutura anguste 

 nigra, scutello nigro ; subtus niger, genubus anterioribus, pedibusque posticis 

 plus minus flavis. Long. *15. 



Mas antennis pectinatis, elytris flavis, apice contortis, biappendiculatis; 

 margine summo nigricante, femoribus tibiisque posticis flavis. 



Femina antennis serratis, elytris flavis, fascia latissima e plagis tribus con- 

 fluentibus composita nigro-virescente, pedibus posticis nigris, genubus testa- 

 ceis. 



Tejon. The colors of the two sexes are so different, as to lead to error. In 

 the male the elytra are yellow, impressed and distorted at the apex, with a 

 small cylindrical black sutural prominence, and a wide concave external one, 

 which is margined with black : the posterior thighs and tibiae are yellow, the 

 former with the upper margin black. In the female there is a long common 

 sutural spot confluent each side with one extending nearly the whole length 

 of the margin, forming a very wide band of a greenish color, and the posterior 

 legs are black, with only the knees and apex of the tibia? yellow. The penis 

 of the male is prominent forming a long cylindrical corneous style. 



58. Byturus grisescens. 



59. Dasytes sordidus. GO. D. squalidus. 61. D. constric- 

 tus. 62. D. luteipes. 



63. Dasytes quadricollis, oblongus nigro-aeneus, pilis nigris ereetis 

 dense vestitus, subtiliter cinereo-pubescens, thorace latitudine breviore. pane 

 subtiliter punctulato, lateribus vix rotundatis, angulis posticis rectis subpro- 

 minulis, elytris dense subtilius punctatis. Long. *17. 



Tejon. Related toD. conformis and sordidus, but differs from both 

 by the sides of the thorax being scarcely rounded, with the posterior angles 

 very distinct. 



64. D. sculptilis, elongatus, parum convexus, thorace latitudine bre- 

 viore, lateribus late rotundatis angulis anticis acutis, posticis prominulis, alu- 

 taceo, praecipue ad latera parce punctulato, linea laterali a margine remota ba- 

 sin ambiente insculpto, elytris alutaceis rugose punctulatis, fortiter marginatis, 

 ad apicem anguste flavis, ano antennis pedibusque rufis, femoribus posticis 

 apice infuscatis : unguiculis internis appendice longa instructis, externis ad 

 basin late dentatis. Long. *15. 



One specimen, Tejon. A very extraordinary species having very much the 

 appearance of a small Trogosita ; the last three joints of the antenna? are a 

 little broader than the preceding. The peculiar sculpture of the thorax, a 

 lateral line remote from the margin, and bending around close to the basal 

 margin, is also found inD. constrictus, but was not previously observed 

 by me on account of the somewhat bad condition of the specimens. It is 

 quite obvious in those collected at Tejon ; in that species, however, the 

 ungues are both furnished with a large appendage as usual. 



65. Rhadalus testaceus. The original of this species, together with 

 1859.] . 



