CARBONIFEROUS ARTHROPOD FAUNA 1 87 



somewhat broader in front of the eyes, its sides otherwise nearly 

 parallel ; posterior angles rectangular, but little rounded ; man- 

 dibles triangular, short, though strong, much curved on their 

 outer border, pointed ; eyes prominent, elongate, narrowly 

 extending along the sides of the head. Head with a broad 

 median longitudinal carina. Antennae slender, setiform. Pro- 

 thorax slender, nearly twice as long as the head, divided at the 

 middle by a transverse sulcus. The anterior part of the pro- 

 thorax is of slightly less breadth than the posterior, its front 

 edge straight. Front coxae comparatively small, attached to the 

 sternum just behind the transverse sulcus, not contiguous on the 

 median line; remainder of the front legs vague. The indica- 

 tions show them to be short and robust. Mesothorax as long 

 as the head, slightly broader than long, quadrate, simple ; the 

 middle legs are attached at the posterior part of this segment, 

 and also are vaguely defined. Metathorax of equal length with 

 the mesothorax, but of gradually increasing breadth, its hind 

 edge circularly excised for the intermediary segment; hind coxae 

 large, prominent, globoso-quadrate, marked with fine longi- 

 tudinal striae, hind femora but twice the length of the coxae, 

 apparently much compressed, marked with longitudinal furrows 

 on the sides and more or less sulcate for the reception of the 

 slender, outwardly bowed tibiae ; tarsi long and slender, the last 

 joint expanding, elongate obcordiform ; claws and empodium 

 visible, one-half the length of the last tarsal joint. Abdomen 

 subcylindrical, slender, slightly longer than the head and thorax 

 together, consisting of eleven segments, including the interme- 

 diary segment, gradually tapering to the middle (sixth seg- 

 ment), then suddenly narrowed on the next two segments, 

 thence subparallel to the tip. Anal cerci visible, apparently 

 about one-half the length of one of the segments of the abdo- 

 men. Wings long, overlapping over the abdomen, two and one- 

 half times as long as broad, veins fine ; costal margin nearly 

 straight, especially on the middle third of the wing; anal margin 

 vaguely defined ; apex of wings apparently rounded. Medi- 

 astinal vein short, not appearing in the faint basal impression of 

 the wing; scapular vein nearly conforming with the costal curva- 

 ture, meeting the margin at the outermost eighth of the wing. 



