1914.] NATURAL SCIENCES OF PHILADELPHIA. 97 



saine, ventro-cephalic angle subrectangulate, ventral margin moder- 

 ately sinuato-emarginate cephalad, ventro-caudal angle broadly 

 rounded, caudal margin oblique-truncate, transverse sulcus well im- 

 pressed dorsad, lateral shoulders slightly indicated in the humeral 

 region. Tegmina very slightly shorter than the dorsal length of the 

 pronotum, the distal extremity slightly surpassing the margin of the 

 proximal abdominal segment, costal margin moderately arcuate, distal 

 margin truncato-arcuate, the lateral angle rounded, sutural margin 

 rotundato-rectangulate at the apex of the stridulating vein, the 

 margin obliquely subtruncate thence to the distal extremity; mar- 

 ginal field narrow, discoidal field expanding from the middle of 

 the tegmen, with a number of irregular areas, stridulating vein nearly 

 transverse, gently arcuate caudad, speculum proper with the greatest 

 length exceeding the greatest width. Abdomen subfusiform; disto- 

 dorsal abdominal segment with the median impressed area transverse 

 and arcuate ; supra-anal plate trigonal with a broad median V-shaped 

 emargination; cerci with the proximal portion straight, robust, 

 cylindrical, distal portion tapering, gently curving mesad, the distal 

 fourth straight, spiniform and at a right angle to the thickened 

 proximal portion, tooth placed at the junction of the proximal portion 

 and the tapering section, on the dorsal section of the cercus toward 

 the external face, moderately acute, subdepressed, little divergent 

 dorsad from the general plane of 

 the cercus, not more than a third 

 the length of the distal half of 

 the main cereal shaft; subgenital 



plate broad, transverse, the great- „. ,^ , ,« ^ .i- 



'■ ... . , . , ,. Figs. IS aad 19. — Outline of subgen- 



est width considerably exceeding ital plate of males (types) of Dichope- 



the length of the plate, lateral Ma castanea (18) and D.brcuihastala 



margins straight convergent in 



the proximal two-thirds of their length, thence parallel for a very 

 short distance, the width of the subequal section about half that 

 of the greatest width of the proximal section, distal margin with a 

 V-shaped emargination mesad, this occupying slightly more than a 

 quarter of the median length of the plate, laterad of this emargination 

 the distal margin is nearly truncate, thus forming lateral angles slightly 

 more acute than a rectangle, a moderately distinct median carina 

 present on the ventral surface of the plate. Cephalic femora subequal 

 in length to the head, pronotum and tegmina, very slender; cephalic 

 tibise distinctly exceeding the femora in length, foramina small, 

 elliptical. Median femora slightly longer than the cephalic femora; 

 7 



