1 8 MELANDER. 



thick. Maxillary palpi plainly five-jointed, second and third joints sub- 

 equal, each a little shorter than firrt, fourth longer than first but more 

 slender, fifth not longer than third plus the fourth, with numerous pale 

 hairs. The bases of the maxillae and the galeae are testaceous, remainder 

 of head black. Thorax flattened above, the mesothorax larger than the 

 others, evenly black, no color markings. Legs black, last tarsal joint 

 alutaceous at tip, ungues pale with piceous apex ; fore metatarsi greatly 

 enlarged, with pale recurved hairs along edge of lower surface, middle 

 joint with similar hairs : tarsi of four posterior legs slender, metatarsi with a 

 dense brubh of thick, short, black bristles beneath, middle joint with paler 

 papilla, third joint slender, long ; middle legs slender ; posterior femora 

 much incrassated. Left anal appendage one-jointed, but articulated with 

 the body, stout, large, clavate, obliquely truncate at tip, lightly rugose. 

 Right appendage two-jointed as usual, the apical joint shorter and thinner 

 than the basal. Both appendages have many long brown to black hairs. 

 Between the appendages are two triangular lamellae. The left one testa- 

 ceous, the right one black and testaceous apically : each armed with an 

 apical spine pointing transversely outward. The median portion of the 

 last ventral segment is placed largely towards the right. From the upper 

 surface the secondary sexual characters present a different aspect. The 

 terminal abdominal segment (loth) is obliquely cleft, the cleavage starting 

 near the left side and terminating nearly midway between the appendages. 

 The left portion is prolonged into a hastate slender projection. Near the 

 base of the left appendage arises a flat lighter-colored triangular process 

 (seen from below as the left triangular lamella). This overlies the hastate 

 projection. The right portion of the last segment terminates in a flattened 

 bifurcate process, the outer tooth of which is bent downward and the upper 

 tooth to the right. The ninth abdominal dorsal segment is very narrow, of 

 about one third the depth of the others : its posterior margin is arcuate, 

 bulging outward on the right side and emarginate on the left. 



From above the head is one half longer than broad, wide at 

 the rather prominent eyes and then sloping suddenly forward and 

 less so behind the eyes ; hind angles very oblique ; head not at 

 all quadrangular in outline ; no impressed markings ; surface 

 evenly, finely rugulose. 



Among other characters, the shape of the head, the structure 

 of the antennae, the color of the hairs and body and the remark- 

 able sexual organs are peculiar to this species and readily distin- 

 guish it from the other species of OlyntJia. 



One wingless specimen from Cuernavaca, Mexico, taken De- 

 cember 26, 1900, by Dr. Wm. W. Wheeler while excavating a 

 nest of Leptogenys wlieclcri Forel. 



