242 PROCEEDINGS OF THE ACADEMY OF [May-Oct., 



In addition to the type we have before us a paratypic male, dif- 

 fering from the type solelj' in being shghtly smaller. 



PHIBALOSOMINAE. 

 Bactridium grande new species. (Plate X, fig. 12.) 



A very striking new species allied to B. dentipes Redtenbacher, 

 emortuale (Saussure) and gracile (Serville), but differing from all in 

 the much shorter operculum of the female, which does not exceed 

 the apex of the body, and also from the individual species as follows : 

 from dentipes in the larger size, in the presence of very decided teeth 

 on the dorsal and ventro-external margins of the cephalic femora, 

 in the relatively longer limbs and in the different spination of the 

 median and caudal limbs; from emortuale in the relatively longer 

 limbs and in the absence of lobes on the proximal section of the 

 ventral margins of the median femora; and from the poorly defined 

 gracile in the much greater size and the more spinose ventral carinae 

 of the median femora. 



Type. — 9; Santa Catharina, Brazil. [Hebard Collection, Type 

 no. 401.] 



Size very large; form elongate and as usual in the genus. Head 

 nearly twice as long as the pronotum, subovate in outline when seen 

 from the dorsum, the greatest width (across the eyes) contained one 

 and one-half times in the length of the head; occiput subdeplanate, 

 the caudal margin of the same weakly produced mesad and shallowly 

 divided into two by a faint longitudinal impression, laterad of which 

 production there is another faint impression in the same margin, 

 the lateral margins of the occiput moderately and regularly converg- 

 ing caudad from the eyes; no apparent ocelli present; eyes moder- 

 ately produced, subglobose; antennae missing except for the two 

 proximal joints, the first of which is quite slender and elongate, de- 

 pressed. 



Pronotum moderately longitudinal, slightly l^roader caudad than 

 cephalad; cephalic margin obtuse-angulate, strongly elevato-cingu- 

 late; lateral margins shallowly arcuate-emarginate cephalad, sub- 

 parallel caudad; caudal margin arcuato-emarginate ; cephalic inter- 

 marginal sulcus with a distinct median and paired lateral fossae, 

 median transverse impression well marked mesad, obsolete laterad. 

 Mesonotum about three times as long as the head and pronotum 

 together, non-carinate. Metanotum (with median segment) about 

 two-thirds as long as the mesonotum, of similar structure; median 

 segment subequal in length to the metanotum proper. 



