68 PROCEEDINGS OF THE ACADEMY OF [Jan., 



Aplopus achalus"' n. sp. 



Type.— d" ; Acljuntas, Porto Rico, April 12, 1900. (Dr. C. W. Rich- 

 mond.) [Cat. No. 7,344, U. S. N. M.] 



Compared with jamaicensis Drurj^, the closest allied species, this new 

 form may be separated by the unarmed head and mesonotum, the 

 longer tegmina, the slenderer and weaker Hmbs, and the coloration. It 

 appears very unhkely that this is the male of angulata St oil {=mi- 

 cropterus Lep. and Serv.), as the female of that species has very promi- 

 nent cephahc spines, and in all respects resembles the females of other 

 species of the genus, the known males of which are very different from 

 this in structure. Stoll's species was recorded from Porto Rico by 

 Haan,22 but there appears no likelihood that this new form is at all 

 closely allied to it. 



Size rather small; form moderately elongate; surface subglabrous. 

 Head ovate, depressed; occiput without spines; eyes subglobose. 

 Antennse equal to the head, thorax and tegmina in length, robust, fili- 

 form, basal joint depressed, the inferior siu-face concave. Pronotum 

 subquadrate, somewhat constricted posteriorly, anterior margin con- 

 cave, the posterior convex; transverse anterior sulcus obsolete cen- 

 trally, transverse median sulcus distinct, strongly impressed, 

 longitudinal median sulcus slight, not extending the whole 

 length of the pronotum. Mesonotum slightly over three times the 

 length of the pronotum, gradually expanding posteriorly, surface with 

 several irregular obsolete tubercles. Metanotum equal to the meso- 

 notum in length; metathoracic pleura and metasterniun rugulose; 

 the whole metathorax depressed. Tegmina equal to the mesonotum 

 in length, acute-oVate; median protuberance somewhat longitudinal, 

 acute. Wings long, reaching to the seventh abdominal segment. 

 Abdomen with all the segments more or less longitudinal, gradually 

 decreasing in size from the base to the sixth segment ; sixth and follow- 

 ing segments distinctly carinate and tectate; seventh and eighth seg- 

 ments of the same general form, the latter slightly the shorter; ninth 

 segment slightly shorter than the eighth segment, somewhat con- 

 stricted toward the apex, apical margin subtruncate with a very broad 

 and shallow median emargination ; cerci about two-thirds the length, 

 subequal, apex blunt ; subgenital opercule very slightly exceeding the 

 apical margin of the eighth dorsal segment, cymbiform, carinate, apex 

 rounded with a narrow median triangular emargination. Anterior 

 femora equal to the pronotum and mesonotum in length, basal flexure 



21 axay^og, i.e., unarmed. 



^'^ Verhandl. Natuurl. GescMed. Nederl. Overzeesche Bezitt., Orth., p. 103, 1842. 



