520 



Ilbumia olympica sp. u. Fig. 16, a, b. 



Male. Brachypterous ; length .S.3 mm., tegmen 2.4 mm. Length of 

 vertex 1.7 times the width, base slightly behind the middle of eyes, slightly 

 narrower than apex, the carinae projecting well forward in middle of 

 apex; length of face 2.7 times the width, slightly broadest on apical 

 half, forking of median carina near the apex, but they do not form two 

 distinctly separate carinae, but a broad, flat ridge narrowing towards the 

 apex; antennae reaching near to the middle of clypeus, seeoml joint 1.4 

 times the length of first; hind femora reaching a little yeyond the apex 

 of abdomen, tibiae longer than femora, first hind tarsus considerably 

 longer than the other two together, spur' with nine or ten teeth. Opening 

 of pygofer broader than long, anal angles produced and curved nearly 

 enclosing the anal segment, medio-ventral edge produced into a pointed 

 process; anal segment without spines; genital styles flat, broadest at base, 

 narrowest in middle, apex truncate, slightly oblique; aedeagus short, 

 slightly compressed laterally, deep, more so at base, the orifice large, 

 occupying the apical half of the dorsal aspect, the edge set with several 

 small spines, a circle of small spines slightly apical of middle. 



Vertex and face dark shiny chiestnut, clypeus lighter with darker marks 

 between carinae; antennae fuscous, thorax fuscous, lighter between carinae, 

 legs fuscous, abdomen fuscous lighter at base. Tegmina light brown or 

 yellowish, veins black, a black mark at apex of clavus and a smaller one 

 at apex of costal cell, granules small bearing black macrotrichia. 



Female. Brachypterous; length 2.7 mm., tegmen 1.9 mm. Much lighter 

 in color than the male. 



Castle trail, Oahu, elevation about 2000 feet, on Lobelia sp. 

 (Szuccey. August, 1920). Described from three males and one 

 female. This species is very isolated ; it might equally well be 

 placed near /. lialia or /. osteliae. 



Ilbumia lobeliae (Muir). Fig. 3, a. 



The genitalia has not been previously figured. 



