30 University of Michigan 



Orthoporus etholax, sp. nov. 



PI. 14, Figs. 92-96 



This is a dark species characterized by having the caudal 

 portion of the metazonites darker than the anterior portion, 

 in specimens in full color the dark brown or dusky caudal 

 band embracing a little more than a third of the length of 

 metazonite and ordinarily bordered in front by an abruptly 

 paler line or narrow stripe. Anterior region of metazonite 

 and prozonite brown, the prozonite becoming paler cephalad, 

 but with anterior border of covered portion ordinarily very 

 dark. Last tergite dark excepting a narrow caudal border on 

 each side, and sometimes median area somewhat lighter, this 

 tergite and the anal valve typically of an olivaceous cast. Col- 

 lum with a narrow light border all around limited within by 

 a blackish band, the central area paler. Head dark across 

 vertex, paler below. Legs typically dark brown to light brown, 

 the legs agreeing in color in general with the body. 



A'ertigial sulcus of head distinct. Clypeal foveolate 2-{-2. 

 Eyes transversely elongate, with inner end acute and upper 

 margin convex ; separated by less than their diameter. Ocelli 

 arranged in six series, about 56 or 58 in number; e. g., 13, 12, 

 1 1, 9, 7, 4, and 12, II, 9, 8, 5, 2. Head back of antennal socket 

 and below eye with a smooth margining ridge, this ridge con- 

 tinuing along the notch ; area in front of the ridge roughened. 



Collum in female with inferoanterior angle obtuse, the 

 inferocaudal one rounded. Ty})ically with three deep sulci 

 above the margining one and a characteristic furrow curving 

 dorsocaudad from near middle of uppermost of these sulci, 

 this furrow not attaining the caudal margin. Or there are 

 four sulci if the weaker one at edge is regarded as margining 

 sulcus. (See I'l. 14. Fig. 93.) Collum of male with ante- 



