44 PROCEEDINGS OF THE ACADEMY OF [Jan., 



Measurements. 



Total length 125.5 mm. 



Length of pronotum. 6 " 



Length of mesonotum, 2S " 



Jjength of metanotum (with median segment). 22 " 



Length of abdomen 65 " 



T^ength of anterior femora. 24 " 



Length of anterior tibiae. 24.2 " 



Length of median femora, LS " 



Length of posterior femora,, 20 " 



Carausius mammatus n. sp. 



Type.— 9 ; Island of Obi, Moluccas. [A. N. S. Phila., presented bj^ 

 Mr. Morgan Hebard.] 



This new and interesting form exhibits some relationship with C. 

 mercurius Stal,^ from an unknown locality, but differs in the form of 

 the apical segments of the abdomen and the character of the expan- 

 sion of the anterior tibise. Kirby's Dixippus (?) insidaiis'^ from Thurs- 

 day Island appears to be related to the new form, but can be separated 

 by a number of characters. 



Size rather large; form moderately slender; surface evenly rugulose. 

 Head slightly contracted posteriorly; interocular region with a trans- 

 verse ridge, incised centrally and laterally developed into acute erect 

 dentiform processes; eyes rather small, subovate; tubercles on the 

 posterior half of the head arranged in distinct longitudinal series ; an- 

 tennae not quite equal to half the length of the body, the basal joint 

 depressed, subovate, expanded, second joint half the length of the first. 

 Pronotum subequal in width, the anterior and posterior margins sub- 

 truncate, transverse median sulcus short. Mesonotum slightly ex- 

 panded posteriorly, a fine median carina present and extending a con- 

 siderable distance on the abdomen. Metanotum (with median seg- 

 ment) equal to two-thirds the length of the mesonotum, subequal in 

 width ; median segment slightly more than two-thirds the length of the 

 metanotum alone. Abdomen with the three basal segments longi- 

 tudinal, subequal in width; fourth segment with slight lateral expan- 

 sions on the apical half, slightly exceeding the basal segments in width ; 

 fifth segment strongly expanded and moderately inflated, the expansion 

 greatest on the apical portion, dorsal surface with a pair of median 

 transversely disposed mammillate tubercles ; sixth segment equal to the 

 first in width, in length equal to the fifth, both segments being some- 

 what shorter than the basal ones; seventh, eighth and ninth segments 



^ Annales Soc. Entom. Belg., Comp.-rend., XX, p. Ixxii. 

 ^ Trans. Linn. Soc, 2d ser, zool., VI, p. 460. 



