100 



INSECTS OF SAMOA. 



fuscous. Differs from R. obscuricornis, Dallas (^^ abdominalis, Westw.) in 

 having the large yellow spots of the meso- and meta-pleura oval in shape (not 

 parallel-sided), their margins not, as they are in R. obscuricornis Dall., continuous 

 with each other and with those of the yellow stripe on side of head and pro- 

 pleuron ; also differs by the absence of the black vitta on the disc of the venter. 



R. horvathi, Bergr. (= R. serripes Horv. nec Fabr.), recorded from Thursday 

 Is., is apparently synonymous with i^. obscuricornis Dall., a well-known Queens- 

 land species. R. insularis is probably identical with the undetermined species 

 recorded by Kirkaldy {Proc. Linn. Soc. N.S. Wales, XXXIII, p. 353, 1908) as 

 occurring on Mauritius bean {Mucuna atropurpurea) in Fiji. 



R. insularis obscurus, var. n. 



There is a female specimen from Tutuila, referable to this species, which 

 is much darker than typical males, and which differs in having the yellow spots 

 on the meso- and meta-pleura practically obsolete. The propleural stripe is 

 also much reduced, and there is a trace of pale subapical annulation on the 

 hind femur. This specimen apparently represents a distinct race. 



Tutuila :— -Pago Pago : 1 $ (type), 18.ix.l919 (Swezey and Wilder). 



17. Riptortus tutuilensis, sp. n. (Text-figs. 4 and 5). 

 Colour. — Dark chestnut brown, densely covered with short but thick, 

 rather tomentose pale golden pubescence, particularly dense on the pronotum, 

 and giving the pronotum a pale yellowish colour. Apex of tylus, lateral margins 

 of head in front of eyes, and a stripe behind each eye, obscure fulvous yellow ; 

 eyes reddish-brown, antenna fulvous, the first segment darker, apices of first, 

 second, and third segments black, basal third of fourth segment yellow : under- 

 side of head dark brown, with a broad dull yellow stripe down each side ; rostrum 

 dark ferruginous brown with apex black. Pronotum appearing dull yellowish- 

 white, the anterior lobe (calli) and posterior margin, dark brown, lateral margins 

 of humeral spines glabrous shining yellow. Propleuron yellowish-grey, with 

 short, broad dark brown stripe behind the eye, laterad of a dull yellow spot 

 over base of acetabula, and the lateral margin brown. Scutellum deep fer- 

 ruginous brown with the apex glabrous yellow. Meso- and meta-pleura pale 

 brown, more or less variegated with deeper brown, the whole appearing yellowish- 

 grey by reason of the pubescence ; the acetabulae, posterior margins of pleurites, 

 and rim of odoriferous orifice dirty yellow. Pro- and meso-sterna dark brown. 

 Hemielytra chestnut brown, the puncturation as in R. insularis, but with a 



