NORTH AMERICAN BOSTRICHIDAE 71 



middle, obsolete at sides ; labrum finely, densely punctate ; first segment 

 of antennal club quadrate. 



Pronotum quadrate, arcuately emarginate in front, widest along 

 middle, strongly deflexed anteriorly; sides broadly rounded, more 

 strongly converging anteriorly, produced into a rather large unci- 

 form horn at apical angles: surface densely, coarsely imbricate-punc- 

 tate on basal half, densely tuberculate on apical half, the tubercles 

 broad, semierect. and rasplike, with four or five large rasplike tubercles 

 on each side along lateral margin, sparsely clothed with short, semi- 

 erect, yellowish hairs on apical half. Scutellum densely clothed with 

 short, yellowish hairs. 



Elytra at base subequal in width to pronotum at middle, truncate 

 at base, each elytron with two costiform tubercles at top of apical de- 

 clivity: sutural margins slightly elevated on apical declivity: sides 

 parallel, conjointly broadly rounded at apices, the margins strongly 

 elevated toward apices; surface glabrous, coarsely, rather densely, 

 irregularly punctate. 



Body beneath densely clothed with rather long, recumbent, yellow- 

 ish hairs: abdomen finely, densely punctate, with numerous large punc- 

 tures intermixed. 



Fern alp. — Differs from the male in having the apical horns on the 

 pronotum smaller, and without or with only vaguely indicated costi- 

 form callosities on the apical declivity of the elytra. 



Length 8.5-14 mm., width 2.7-5 mm. 



Type locality. — Of corny ins. Jamaica; type was in the Berlin Mu- 

 seum. Of bicornutus* original publication not available. Of puncti- 

 pennis, Texas. California, and Sonora, Mexico: types in the LeConte 

 Collection in the Museum of Comparative Zoology, Cambridge. Mass. 

 Of peregrinus, Peru: type was in the Berlin Museum. Of migrator. 

 Nicaragua and Sandwich Islands; type in the British Museum. Of 

 maritimus. Galveston. Tex. ; type in the Casey Collection in the United 

 States National Museum. 



Distribution. — Specimens have been examined from many localities 

 in Arizona. California. Colorado. Utah. Texas. Xew Mexico. Florida. 

 Lower California. North Carolina, Mexico. Nicaragua, Costa Rica. 

 Colombia. Venezuela. Peru. Ecuador. Cuba, Puerto Rico. Antigua, and 

 the Hawaiian Islands. It has been reported also from Brazil. Guate- 

 mala. Panama. Guadeloupe. Jamaica, and the St. Thomas and St. Mar- 

 tin Islands. It has been introduced into the Hawaiian Islands, where 

 it has become acclimated. 



Host*. — Herbert (1920) stated that rnesquite appears to be the nat- 

 ural host plant of this species. The species has been recorded as bur- 

 rowing in apricot, peach, fig. grape, pear, orange, pecan, locust, wild 

 cotton, bamboo, Vacheltta farnesiana, Aferostachi/s race?jiif!ora. and 

 dry Arthrostyliwm longifoliwn used as sheathing on a roof of a house 

 in Mexico. Hubbard (1888) recorded finding adults of this species in 

 the half -burned roots of Srnilax at Key West, Fla. 



Pallas (1772) described cornuta from a female from Jamaica, and 

 Latreille (1833) described the male of the same species under the name 

 of bicornv.tus. Lesne in 1896 placed bicormitu* as a synonym of 

 rivfiis. and in 1899 also placed peregrinus Erichson (1847). migrator 

 Sharp ( 1885). and punctipennis LeConte (1858) as synonyms of cor- 

 nutus Pallas (1772) . After examining the type of . 1 mpfucerus mari- 



