DYNASTIN.E 233 



throughout, the anterior canthus of the eye very moderate; transverse 

 ridge high, bilobed; clypeal apex not very obtuse; mandibles concave 

 dorsally as usual; mentum very coarsely punctate; prothorax unusu- 

 ally transverse, fully two-thirds wider than long, the sides oblique 

 and feebly arcuate in anterior half, parallel and feebly arcuate 

 posteriorly to the very broadly rounded basal angles; base broadly, 

 feebly arcuate medially; concavity deep, circular to transversely 

 oval, about a third the width and half the length of the pronotum, 

 very coarsely rugose; punctures coarse and slightly separated 

 laterally, subconfluent along the base sublaterally, very coarse, 

 rugose and confluent antero-laterad, elsewhere less coarse and widely 

 separated; median line feebly impressed; tubercle low, obtuse and 

 binodulose; scutellum broadly ogival, obtuse at tip, smooth; elytra 

 nearly a fourth longer than wide, only a fifth or sixth wider than the 

 prothorax and nearly two and one-half times as long, very evenly 

 and circularly rounded behind from very near the middle of the 

 length, each with several impressed lines and with rather small 

 sparse punctures throughout, sometimes larger and irregularly 

 impressed near the suture basally; pygidium smooth and glabrous 

 in the concave lower part, the apical margin dilated at the middle 

 and with close-set irregular punctuation and pubescence; last ventral, 

 except apically, and the penultimate medially, moderately and 

 rather closely punctate, the segments with the usual single entire 

 lines of small setigerous punctures. Length (9) 31-0-35.5 mm.; 

 width 17.0-19.0 mm. Arizona and New Mexico. Five examples. 



[Strategus cessus Lee.] cessus Lee. 



A Pygidium ( 9 ) with the transverse ridge still further above the middle. 

 Body as in cessus but a little more elongate, the anterior canthus 

 of the eye larger and more prominent, the prothorax less 

 abbreviated and the elytra rather longer, more evenly parallel, 

 more deeply sinuate medially at base, broadly rounded behind 

 in barely apical third and with the sculpture less obsolete, there 

 being in about inner third and basal two-thirds rather large 

 though feebly impressed and transversely subrugose punctuation; 

 last ventral segment completely impunctate and smooth though 

 finely, closely punctulate along the basal margin, the penultimate 

 with only a few fine punctures medially. Length (9) 33-8 mm.; 

 width 18.0 mm. A single example, without indication of locality 



but probably from New Mexico cavicauda n. subsp. 



5 Body broad and oblong, deep black, strongly shining, pale castaneo- 

 rufous beneath; head (cf ) nearly two-fifths as wide as the prothorax, 

 very coarsely punctato-rugose, the clypeus less coarsely, the trans- 

 verse ridge strongly elevated, feebly sinuate medially, not attaining 

 the sides; clypeal apex feebly upturned, unusually acute; anterior 

 tooth of the mandibles distinct but broadly rounded, the posterior 

 obsolete; prothorax fully three-fourths wider than long, the sides 

 strongly rounded, becoming straighter and very oblique anteriorly, 

 the basal angles broadly rounded; depression a third the total width 

 and half the length, oval, very deep, the bottom coarsely but shal- 

 lowly punctato-rugose, the tubercle broadly and evenly obtuse at 



