TRIASSIC INSECTS OF COLORADO. 4G3 



vein than in S. gardineri, producing a small stigma, bnt its further structure cannot be 

 told from either of the specimens, and the anal area is not preserved. 



In this species the wing appears to be more slender than in the others, although the 

 exact proportions cannot be given from the imperfection of the specimens; all the 

 branches have a more longitudinal and less arcuate course, the externomedian and scap- 

 ular veins scarcely part from each other to give place to the stigma, and the divergence 

 of the former and the internomedian veins is also less conspicuous. The wing was prob- 

 ably about 15 mm. long, and 5 mm. l)road. 



Two specimens obtained, Nos. 23, 59 and 60. 



3. Spiloblattina guttata. 



PI. 41, fig. 2; pi. 42, fig. 14. 



SpiloUattina guttata Scudd., Proc. Acad. ISTat. Sc. Philad., 1885, 3G-37. 



Although no perfect fore wing has been discovered, it was evidently stouter than in 

 the other species found and was perhaps not much more than twice as long as broad; the 

 costal margin is nearly straight in the middle. The mediastinal area is wider than in 

 the other species, terminating more abruptly, and is filled with less longitudinal branches 

 pretty closely crowded; it terminates directly opposite the scapular-externomedian 

 stigma, or a little earlier than in 8. gardineri. The scapular vein runs in a nearly 

 straight but slightly sinuous course at a considerable distance from the mediastinal ; its 

 branches, at first compound, afterwards deeply forked and then single, are five or six in 

 number, scarcely more longitudinal than the mediastinal branches, and it would appear 

 as if the last could not come very near the tip of the wing as it does in 8. gardineri; the 

 first vein is given off about opposite instead of far before the last branch of the medias- 

 tinal and after its second branch it begins gently to recede from the costal margin to 

 share in the embrace of the adjoining stigma. The externomedian vein first forks about 

 opposite the end of the mediastinal area, and sends four or more longitudinal mostly sim- 

 ple branches to the apical margin, the basal ai-cuation of the first branch serving for the 

 embrace of the smaller, the sinuous course of the main vein for that of the larger, stigma. 

 The internomedian vein has the same strongly sinuous course as in 8i. gardineri, and 

 the branches are arcuate, distant, parallel, and so far as can be seen, all simj:)le. Anal 

 area unkno^vn. 



There is a single hind wing (fig. 11) which appears to belong here as it agrees closely 

 with the hind wing of 5*. gardineri except that a broader wing is indicated by the greater 

 width of both the mediastinal and scapular areas, and therefore more in accordance with 

 the pix'sent species. 



This species differs from the others in the stoutness of the wing, which is proportionally 

 much shorter than any of the others; in keeping with this peculiarity is the greater width 

 of both the mediastinal and scapular areas, and the more rapid descent to the margin of 

 the termination of at least the former. In other respects the species completely resembles 

 S. gardineri. 



The fore wing was apparently about 15 mm. long and 7 mm. broad; the length of the 

 fragment is 8.5 mm. 



Two specimens, Nos. 19, 27. 



