CHEYSOMELIDAE. 



183 



very small and also thickened, third slender, about twice as long as second, 

 fourth slender, longest, twice as long as third ; fifth to eleventh segments about 

 equal to each other in length. Prothorax broader than long, somewhat narrowed 

 in front, lateral margins almost straight or very slightly rounded, posterior 

 margin with a feeble median lobe ; upper surface uneven, with shallow depres- 

 sions and elevations, gently sloping on each side in front, very roughly 

 sculptured, covered with coarse and 

 large punctures, which, coalescing, 

 form channels and ridges. Scutellum 

 subpentagonal, longer than broad, 

 broader at base, narrowing at apex, 

 which is rounded ; surface strongly 

 punctate. Elytra very slightly 

 broader at base than prothorax, 

 confusedly, closely and strongly 

 punctate ; surface uneven, humerus 

 strongly elevated, with area posterior 

 to it depressed ; on inner side of 

 it there is also a depression con- 

 taining a ridge. Around and behind 

 scutellum a certain area is depressed. 

 A well-marked depression in middle 

 of each elytron behind basal area ; 

 among ridges produced by these de- 

 pressions on the surface, especially 

 prominent are a costa parallel to 

 suture, and a rather large elevation 

 in middle area. (These depressions 

 and prominences are best seen when 

 the insect is held at various angles.) Under side not so hairy as upper side ; 

 abdominal sternites punctate. First segment of posterior tarsi longer than 

 corresponding segment of anterior or middle tarsi. 

 Length, 5-6 mm. 



Tutuila : Eastern end of island, 1,070 ft., 21 .v. 1918, 1 example (Kellers). 

 Avau, 19.iii.1926, 1 example. Amouli, 17.iii.1926, 1 example (Judd). Fagasa, 

 9.ix.l923. 4 examples (Swezey and Wilder). Pago Pago, 12-16.iv.1924, 



Text-fig. 3. — Stygnodia aenescens, sp. n. xll- 



