598 



the entomological service of Sniitli Africa, who extended me 

 many courtesies during my stay in Sonth Africa. 



34. A ]lSEW SlLAO.X FKO.M THE HaWAHAX i.SLANDS WITH 



Descriptions of two others from California. 



Silaon rohweri n. sp. 



Female : Length 4.5 mm. ; wing 3.5 mm. 



Black ; mandibles piceous at apex ; transverse spots on either side 

 of collar, apex of tubercles, small spots on tegulae. small spot on either 

 side of metanotum, oval spot posteriorly at apex of front and middle 

 tibiae, interrupted .stripe on dorsal surface of hind tibiae not attaining 

 base or apex, and calcaria yellowish-white ; wings dusky subhyaline, 

 strongly iridescent, venation dark brown. 



Body with fine silvery pile covering the surface on the sides of the 

 clypeus and sides of face. 



Mandibles simple, clypeus produced in the middle and rounded with 

 a rounded median longitudinal ridge continued as a fine carina to 

 about the middle of the eyes, disappearing at the protuberance of the 

 front ; front vaguely and indefinitely impressed longitudinally in front 

 of the anterior ocellus ; eyes somewhat convergent above ; ocelli in an 

 obtuse triangle, the posterior ones in front of a line connecting the sum- 

 mit of the eyes, nearer to the eye margin than to each other; process 

 and median ridge of clypeus smooth and shining, a few coarse punctures 



SiUniii rohiccri. 



on the edge of the pubescence which conceals the sides ; front and ver- 

 tex strongly confiuently punctured, the genae and occiput more finely 

 so. 



Collar not margined or carinate anteriorly ; mesonotum, scutellum, 

 and mesopleura closely and subconfluently punctate ; basal margin of 



