50 PROCEEDINGS OF TFIE ACADEMY OF [Jan., 



have provisionally determined it as this species. The following is a 

 brief diagnosis : 



Size small; form somewhat slenderer than in the type, but otherwise 

 similar. Head with the auricular appendages very prominent, the 

 margins sinuate, about reaching the posterior margin of the head; 

 eyes ovate. Mesonotum with the median processes as in the type, but 

 more pronounced; a distinct longitudinal median carina developed. 

 Metanotum with a distinct median carina; lateral margins with 

 distinct sinuous carinse. Abdomen as in the type, but all of the 

 longitudinal plicae exaggerated; lateral lobes of the sixth dorsal 

 segment not differing materially from that of the other specimen; 

 seventh dorsal segment about equal to the sixth in length, tectate, 

 strongly carinate; eighth and ninth segments subequal in length, 

 supplied with a number of sinuous longitudinal rugse, the eighth 

 apically supplied with a median pair of low rounded lobes, the ninth 

 with the apical margin truncate; supra-anal plate moderately pro- 

 duced, rounded, hirsute ; cerci very short, simple, not extending beyond 

 the apical margin of the ninth dorsal abdominal segment; subgenital 

 opercule extending slightly beyond the apex of the eighth dorsal seg- 

 ment, carinate, apex rectangulate ; terminal ventral segment rectangu- 

 late; apex narrowly incised. Limbs as in the type but stouter. 



Measurements. 



Total length, 46 mm. 



Length of pronotum, 3.5 " 



Length of mesonotum, 12 " 



Length of metanotum (with median segment), 6 " 



Length of median segment, 2.1 " 



Length of abdomen, 2.3 " 



Length of anterior femora, 9 " 



Length of anterior tibiffi, 8 " 



Length of median femora, 6.5 " 



Length of posterior femora, 9.5 " 



Genus DIAPHEROMERA Gray. 

 1S35. Diapheromcra Gray, Synops. Pliasm., pp. 13 and IS. 

 Type. — Diaiphcromera sayi Gray = Spectrum jemoratum Say. 



Diapheromcra calcarata (Burmeister). 



1S3S. B\acteria\ (Bacvnculus) calcarata Burmeister, Handb. d. Entom. 

 II, p. 56G. [Mexico.] 



Four specimens, two males and two females : Alta Mira, Tamaulipas, 

 Mexico, Jime 28, 1903. (M. E. Hoag.) [A. X. S. Phila.] Guaymas. 

 Sonora, Mexico. [U. S. N. M.] 



