126 ARCANA NATURJÎ. 



opaca, Say (considered by Lacordaire as a geniiine Asida) from the othor species, placed by me in 

 Pelecijphonis, is the distinct fissure each side of the gula, permitting the base of the maxillse to be seen ; 

 and it was for this reason that I placed Â. opaca in Eiischides, which differs only by the posterior 

 angles of the thorax not being distinct; a character certainly not of generic value; and a slight dif- 

 férence in the form of the mentum. 



AMPHIDORA, Esch. 



14. A. oscuLANS, oblonga, atra nitida, pilis longis fiilvis dense vestita, thorace subtransverso, late- 

 ribiis Dcilde rotundatis , confertimpunctato, posticeangustato, angulis posticis minutis redis; elytris seria- 

 timpunctatis, interstitiis sat dense rugosis etpunctatis. — Long. 15 mill. — ïab. XII, fig. 4. 



Leconte, Annals ofthe Lyceim of Natural History of New York, V, 136. San Diego and Santa Isa- 

 bel, Galifornia. Resembles in form A. littoralis, Esch., but is much larger. The anterior tarsi of the 

 maie are not dilated as in that species (as they also are, but more feebly in A. nigro-pilosa, Lee), but 

 the posterior tibiae, about one-fourth of their length from the apex, on the inner margin, are armed 

 with a small acute tooth. 



TANARTHRUS, Lee. 



15. T. SALiNus, depressiis, riifo-testaceus, tenuiter cinereo-pubescens, subtiliter punchdatiis, capite 

 thoraceque nitidis, illo magno basi emarginato, antennarum articula ultimo prœcedentes 4 œquante. — 

 Long. 6 1/2 mill. — Tab. XIII, fig. 8. 



Leconte, Annals of the Lyceum of Natural History of New York, V, 156 ; Proceedings of the Academy 

 of Natural Sciences of Philadelphia, VI, 104. Colorado Désert, on the margin of a saltlake, flying over 

 the half-dried mud like a Bembidium. 



This genus belongs properly to the family Anthicidœ, Ihe eyes being entire. I regret that, by a mis- 

 conception of my observation [Proc. Acad., VII, 277) regarding a supposed species of Xylophilus, 

 X. (?) basalis, Lee, which has the eleventh joint ofthe antennœ elongated as in Tanarthrus, Lacor- 

 daire should hâve considered that I meant to apply the expression « but the eyes are deeply emargi- 

 nate, as in the other species of Xylophilus » to Tanarthrus. It was intended to show that the species 

 under considération X (?) basalis, although possessing the antennae of Tanarthrus did not belong to 

 that genus, nor even to the same family, but was, in essential characters, a Xylophilus. The genus 

 Tanarthrus, in fact, fînds ils place in the family Anthicidœ, and in Lacordaire's synoptic table [Gen. 

 Col., Y, 591), would enter immediately after Anthicus, from which it differs by the last joint of the an- 

 tennae being elongated and almost divided into two, and by the penultimate joint of the tarsi not 

 being bilobed. 



CYSTEODEMUS, Lee. 



16. C. ARMATus, obscure œneo-oUvaceus, opacus, capite punctato, postice canaliculato, occipite conico ; 

 thorace punctato, utrinque spina acuta armato; elytris antrorsum angustatis, dorso antice late depressis; 

 spatiis impressis, irregularibus, reticulatis. — Long. 11-18 mill. — Tab. XIII, fig. 3. 



Leconte, Annals ofthe Lyceum of Natural History ofNew York, V, 158; Proceedings of the Academy 

 of Natural Sciences of Philadelphia. VI, 330. Colorado Désert, California, on Larrea mexicana, or 

 creeping on the sand. The other species of this genus, C. Wislizeni, Lee, has the elytra globose, of a 

 beautiful blue color, cancellate with large punctures and the thorax pentagonal ; it is found in Ari- 



