TRIASSIC INSECTS OF COLORADO. 461 



cuate, but more broadly than in E. persistens, and the anal veins sunilarly arcuate, longer, 

 and pei'haps less numerous. 



Length of wing, 12 mm.; breadth, 5 mm. 



A single specimen and its reverse, !Nos. 28 and 70. 



Spiloblattina Scudder. 

 SjnloblafMna Scudd., Proc. Acad. Kit. Sc. Philad., 1885, 35-36. 



This genus is allied to Etoblattiiia, but dillers from it and from all other genera of 

 Blattinariae in the divergence of the scapular and externomedian veins beyond the mid- 

 dle of the Aving, and then their rapid convergence beyond a more or less conspicuous 

 elongated spot (whence the generic name) which fills the space so produced; a similar 

 arrangement is seen even more conspicuously between the externomedian and interno- 

 median veins, where the spot is much larger and round. 



This genus is only known from the Fairplay triassic, where four species occur. S. 

 gardineri may be considered the type. 



TABLE OF THE SPECIES OF SPILOBLATTINA. 

 Scapular vein as far as its penultimate branch almost completely parallel to the costal margin, not receding from it 

 opposite the middle of the adjoining discal stigma. 

 Wings relatively slender, fully three times as long as broad. 



Scapular faintly approaching the externomedian vein to enclose the stigma between them . 1. S. gardineri. 

 Scapular in no way approaching the externomedian vein to enclose the stigma between them 2. S. triassica. 



Wings relatively broad, not over two and a half times longer than broad 3. S. guttata. 



Scapular vein distinctly receding from the costal margin opposite the middle of the adjoining discal stigma 



4. S. marginata. 



1. Spiloblattina gardineri. 



PI. 41, figs. 4, 6, 8, 10. 



Spiloblattina gardineri Scudd., Proc. Acad. IS'at. Sc. Philad., 1885, 36. 



This was the mo.st common species found at Fairplay, and a number of tolerably per- 

 fect fore wings well exhibit the characteristic discal stigma of the wings ; some hind 

 wings also occurred, and one somewhat crushed specimen with parts of all the wings 

 and some of the body. The foi-e wing is long and slender, more than three times as 

 long as broad, the costal margin very gently convex, the tip produced and attenuated 

 but rounded. The mediastinal vein terminates some way beyond the middle, approach- 

 ing the margin very gi'adually and emitting numerous parallel simple veins. The scap- 

 ular vein runs parallel to the costal mai'gin, slightly more removed from it in the ajDical 

 than in the proximal half, and terminates a little before the tip of the wing ; it first branches 

 a little before the middle of the wing, and has many offshoots usually forked, sometimes, 

 especially the first one, compound. The externomedian vein usually begins to bi'anch 

 beyond the middle of the wing opposite the distal end of the stigma between it and the 

 scapular vein, and its longitudinal, more or less forked branches, which are sometimes 

 superior, sometimes apical, fill the apex of the wing; to form the enlarged cell for the 

 larger stigma, the curve of the main externomedian vein is graceful and gradual. The 

 internomedian vein at first descends rapidly toward the margin as if to terminate near 

 the middle of the outer half, but shortly before reaching it, it bends outward with a sinu- 



