46 PROCEEDINGS OF THE ACADEMY OF [Jan., 



Measurements. 



Length of abdomen, 59 mm. 



I.iength of anterior femora, 22 " 



Length of anterior tibiae, 23 '' 



Length of median femora, 17 '' 



Length of posterior femora, 19.5 " 



Carausius obiensis n. sp. 



Type. — ? ; Island of Obi, Moluccas. [A. N. S. Phila., presented by 

 Mr. Morgan Hebard.] 



Allied to C. mammatits, but differing in the non-nodose fifth ab- 

 dominal segment, the absence of large spines in the head and foliaceous 

 expansions on the anterior metatarsi. 



Size medium; form elongate; surface irregularly granulose. Head 

 rather short, subequal in width; interspace between the eyes with a 

 few rather large granules, but no distinct spines; eyes moderately 

 large, circular; antennae not equal to half the length of the body, basal 

 joint rather elongate, twdce as long as broad, depressed, second joint 

 not quite half the length of the first. Pronotum longitudinal, somewhat 

 compressed posteriorly; anterior margin truncate, posterior l^roadly 

 arcuate; median transverse sulcus short. Mesonotum slightly less 

 than half the length of the abdomen, a median longitudinal carina pres- 

 ent and continued to the apex of the al^domen. Metanotum (including 

 median segment) two-thirds the length of the mesonotum ; median seg- 

 ment tw^o-thirds the length of the metanotum alone, anterior margin 

 obtuse-angulate. Abdomen with supplementary lateral carinae in the 

 apical portion; five basal segments longitudinal, subequal in lengih; 

 sixth segment slightly shorter than the fifth ; seventh, eighth and ninth 

 segments together about equal to the sixth in length, subequal in width, 

 tectate; eighth and ninth segments transverse, each shorter than the 

 somewhat longitudinal seventh; supra-anal plate tectate, carinate, 

 the apical margin rounded; cerci depressed, broad, subacuminate, 

 not equalling the apex of the supra-anal plate in length; subgenital 

 opercule cymbiform, keeled, of moderate size, apex subacuminate but 

 not exceeding the apex of the supra-anal plate, the median carina api- 

 cally undulate. Anterior femora equal to five-sixths the length of the 

 mesonotum, moderately compressed, superior carina slightly expanded 

 and undulate basally, external inferior carina bearing two preapical 

 dentiform processes; anterior tibiae equal in length to the femora, 

 compressed, superior carina developed into a rather low even lamellate 

 ridge which divides apically and encloses a comparatively broad 

 shallow sulcus, inferior median carina developed similar to the superior 



