NO. 1108. PROCEEDINGS OF THE NATIONAL MUSEUM. 271 



ACANTHODESMA, new genus. 



Somewliat resembliug Siilyavata, but is a true member of tlie family 

 Stc)iopo(]'i<Ja\ Form elongate suboval, with a long' spine each side 

 behind base of antenna;, and surface of head with numerous spines on 

 tlie crown and sides; head short, longer behind the eyes than before 

 them, bristly, carinated on the middle line; antennie slender, but not 

 setaceous, as long as the body without the head, basal joint very short, 

 second as long as the pronotum and head together, third and fourth 

 together about equal to the second, but thinner and filitorm, rostrum 

 very stout, a little curved, the basal joint longer than the others con- 

 joined, the apical joint touching the space between the anterior cox.t'. 

 Pronotum bristly hirsute, subtrapezoidal, a little longer than wide, the 

 anterior lobe much shorter than the posterior one, deeply sunken along 

 the middle and sinuated next the head, with the anterior angles carinate 

 and a little produced, behind each angle a long, erect spine followed 

 behind by three or more shorter ones; posterior lobe with a ridge each 

 side and a wide deep groove on the middle line, followed behind by a 

 shallow, depressed, wide area which is terminated each side before the 

 base by a long erect spine, middle of each lateral margin with a spine, 

 humeral angles with a longer oblique spine. Femora with series of 

 strong s]>ines both below and above, tibia' with bristles and very vsleuder 

 spines, the anterior pair with two series of oblique, long spines, middle 

 til)iiTe much shorter than the others. Scutellum longer than wide, sinu- 

 ated each side behind the middle, with the margins callous and reflexed, 

 spinous and with a long spine each side and at tip, veins of corium 

 slender, long, forked, and slightly divaricating posteriorly, veins of the 

 membrane long, the middle ones twice forked, the divaricating branches 

 running backward instead of toward the ti}). ^largin of abdomen 

 close set with spines, one series of which consists of a few longer ones, 

 apex of venter with a long spine each side and in the male two approx- 

 imate slender spines on the middle of the tip, ai)ical margin of the 

 female with six short ones betw^een the two outer spines. 



ACANTHODESMA PERARMATA, new species. 



Pale dull grayish-yellow, with the spines, the middle line of head, 

 sides of face, pubescence, carinate edge, and lines of pronotum and 

 scutellum and line bounding the connexivum whitish yellow. Antenna" 

 dusky yellow, the second joint thicker than the others and armed with 

 series of stifi" bristles. Tips of spines black, acute. Pronotum clothed 

 with shaggy pubescence, median depression margined with acute 

 carina', the surface next outside of these ridges broadly and less 

 deeply, longitudinally, channeled, lateral margin with a slender raised 

 line, posterior margin truncated, a pale line runs back from each of 

 the two middle posterior spines. Scutellum with long hairs, margined 

 with pale testaceous. Lower border of pleura, and the matted hairs, 



