Excerpt from Some Insects of Special Interest From Florissant, Colorado, and Other Points in the Tertiaries of Colorado and Utah
A single fore wing and part of its reverse are all that are known of this dragon ﬂy. The wing is hyaline or very faintly infumated beyond the nodus; the reticulation is testaceous, the principal sector and the main veins above it, with the costal margin, ferruginous, deepening into blackish when bordering the ferrugineo-testaceous pterostigma. This latter is subequal, about four and a half times longer than broad, surmounts less than three unequal cellules, its inner bordering vein subeontinuous with the cross nervule below; twelve antecubitals, seven postcubitals; both triangles subequilateral with crowfoot division into three cells, the upper outer angle of the discoidal triangle perhaps some times severed by a cross vein to form a minute fourth cell outer margin of same triangle slightly bent above, scarcely more than a tenth longer than the upper margin, which in its turn is scarcely more than a tenth longer than the inner margin; of the borders of the inner triangle the lower is the longer, the others subequal.
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