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



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straight, its angles rectangulate, instead of I'ounded with the angles 

 obtuse, in the ultimate (ninth) dorsal abdominal segment of the 

 same sex being two and one-half times as long as broad, instead of 

 equally long and broad, and in the subgenital operculum falling 

 distinctly short of the apex of the dorsal penultimate (eighth) seg- 

 ment, instead of reaching to the apex of the same as in incolumis. 



Type. — cf ; Goyaz, State of Goyaz, Brazil. [Hebard Collection. 

 Type no. 471.] 



Size moderately large: form very elongate and slender, baciUiform. 

 Head with its length nearly one and one-half times that of the pro- 

 notum, the greatest width across the eyes contained twice in the 

 length of the head, the caudal section of the head, i. e. that caudad 

 of the eyes, subequal in width, slightly narrower than the width 

 across the eyes: ocelli absent: eyes very short oval in basal outline, 

 hardly prominent when seen from the dorsiun: antennae not com- 

 plete, in length certainly exceeding the head, pronotum and mesono- 

 tum as remaining portions show. 



Pronotum no wider than the caudal section of the head, the length 

 about twice the median width, the cephalic half faintly narrower 

 than the caudal half; cephalic margin faintly arcuate emarginate, 

 caudal margin very slightly arcuate convex; median transverse 

 indentation pronounced, medio-longitudinal sulcus indicated cepha- 

 lad. Mesonotum about three times as long as the combined length 

 of the head and pronotum, slender, faintly widening caudad, the 

 wadth elsewhere uniform, hardly greater than that of the head, 

 strongly arcuate in transverse section, near each lateral margin 

 with, a continuous but low carina; caudal margin weakly arcuato- 

 emarginate. Metanotum, including the median segment, four-fifths 

 as long as the mesonotum, in general form and sculpture similai' 

 to the mesonotum: length of the median segment contained o\er 

 three and one-half times in the length of the remainder of the meta- 

 notum; caudal margin of the median segment arcuato-emarginate. 

 Meso- and metasternum with paired, prominent lateral carinae 

 prominent throughout their length. 



Abdomen slightly longer than the combined length of the head and 

 thoracic segments, slender, faintly thickened and enlarged at the 

 sutures between the segments; first to seventh joints distinctly 

 elongate, the second to fourth joints slightly the longer; eighth dor- 

 sal segment slender, faintly shorter than the ninth segment, dis- 

 tinctly infolded ventro-distad ; ninth dorsal abdominal segment 

 three-fourths as long as the eighth dorsal abdominal segment. 



