150 



INSECTS OF SAMOA. 



similar to intermediate leg but with the coxa brown except at apex, the femur 

 with eight or nine annulations and the apex deep brown ; tibia with about ten 

 annulations and the apical fourth brown. Abdomen dull dark brown becoming 

 paler on the second and third ventrites, the first ventrite shining black. 



Structure. — Head about as long as wide across eyes (34 : 35) with the 

 anterior and posterior lobes of equal length ; vertex about as wide between eyes 

 as width of eye (12 : 11) ; transverse impression placed on a level with middle 

 of eye, slightly posteriorly curved ; relative leng^ths of antennal segments 

 185 : 216 : 55 (fourth segment mutilated in type) ; relative lengths of rostral 

 segments 24 : 15 : 15. Pronotum intensely smooth and shining longer than 

 broad across humeral angles (46 : 40) the posterior lobe nearly three times as 

 long as the anterior lobe ; medial impression of anterior lobe deep, covered by 

 interlocking hairs from each side of impression ; disc of posterior lobe strongly 

 convex, without sulcations, or ridges ; lateral carinae entirely absent. Meso- 

 and meta-nota with short spines (mesonotal spine broken in type). Hemi elytra 

 slightly longer than abdomen ; discal cell very long, more than tw-ice as long as 

 apical vein, without a small basal cell, strongly indented apically ; stigma long 

 and broad. 



Relative lengths of anterior coxa femur, tibia and tarsus, 40 : 93 : 70 : 15 ; 

 femur with two rows of very short spines and bristles, gradually increasing in 

 length towards base, less than one-fourth the width of femur in middle but 

 each row ending at base in a longer spine about one-half width of femur ; tarsus 

 two segmented. Relative lengths of femur, tibia and tarsus of intermediate leg, 

 190 : 265 : 12, and of posterior leg, 270 : 410 : 12. Basal tergite of abdomen 

 with an erect spine, basal sternite with its posterior margin broadly concave 

 not deeply angularly emarginate. 



Total length, 5 mm. 



Upolu :— Malololelei : 1 $ (type), 2,000 ft., 25.ii.1924. 



Dictynna, subgen. n. 



Differs from Empicoris in the absence of a deep angular emargination of 

 the posterior margin of the basal abdominal sternite and in the smooth intensely 

 shining pronotum with strongly convex posterior lobe entirely without lateral 

 carinae. The first character is, according to McAtee and Malloch, of generic 

 importance. 



Genotype : — Empicoris nitidicollis, sp. n. 



