66 



ENTOMOLOGICAL NEWS. 



[March, 



I. (f Superior ap- 

 pendages viewed 

 from above 



3. (^ Superior ap- 

 pendages, profile 

 view, upper edge 



4. Lower edge ta- 

 pering to apex in 

 its 



Fraternus. 

 more divergent, tlie 

 interval between 

 their tips greater 

 than the length of 

 one appendage, 

 inner edge of each 

 appendage dis- 

 tinctly concave, 

 outer side distinctly 

 convex. 



5. cf Sup. apps. 

 viewed obliquely 

 from above at 45° 

 with the horizontal 

 plane 



Externus. 

 less divergent, the 

 interval between 

 their tips about 

 equal to the length 

 of one appendage, 

 inner and outer 

 edges of each ap- 

 pendage almost 

 straight (fig. 17). 



distinctly convex almost straight (fig. 



(fig. 16). 14). 



apical third, a small 

 tubercle on the 

 lower edge 'where 

 the tapering begins, 

 at which point the 

 appendage is hard- 

 ly thicker than else- 

 where in its post- 

 basal portion (fig. 

 16). 



showing no tuber- 

 cle on the basal side 

 of the one men- 

 tioned above. 



apical half, a small 

 tubercle {a, fig. 14) 

 on the lower edge 

 imniediately before 

 the extreme tip, the 

 appendage distinct- 

 ly thicker where the 

 lower edge begins 

 to taper than at any 

 other point in its 

 postbasal portion. 

 (like fraternus) , 

 (fig. 12). 



Crassus. 

 more divergent, the 

 interval between 

 their tips greater 

 than the length of 

 one appendage, 

 inner edge of each 

 appendage slightly 

 concave, outer 

 edge angulate, 

 forming two un- 

 equal limbs meet- 

 ing at an obtuse 

 angle at f the length 

 of the appendage 

 (fig. 18). 



distinctly convex 

 (fig. 15). 



apical sixth, a small 

 tubercle {a, fig. 15) 

 on the lower edge 

 7vhere the tapering 

 begins, at which 

 point the appen- 

 dage is not as thick 

 as in the proximal 

 portion. 



showing an obtuse 

 tubercle * {b, fig. 

 13) on the external 

 surface, to the ba- 

 sal side of the tu- 

 bercle a above men- 

 tioned, from which 

 it is separated by a 

 distinct concave 

 edge whose length 

 is i-J of the length 

 of the appendage. 



* This tubercle is the termination of a carina extending along the outer surface 

 of the appendage almost from the base (compare fig. 15), and is the cause of the 

 angulation of the outer edge of the superior appendage seen in dorsal view as 

 shown also in fig. 18. The carina exists in fraternus and externus, but is less 

 marked and does not end in a tubercle. 



