14 BOLTOX, " Mark Stirrup " Collection of Fossil Insects. 



ornament consists of a series of low irregular ridges running 

 from the centre to the margin, becoming feebler as the margin 

 is reached. 



Teguiina. — The tegmina are clearly distinguishable, that 

 of the left side being almost ]>erfect, and 33 mm. long. The 

 right tegmen has lost the basal third, owing to the matrix being 

 broken away. 



Left Teguicn. — The costal margin is convex, and slopes 

 inwards from the sub-costal area back to the wing ay)ex, the 

 latter being more acutely rounded than in most blattoids. 

 The sub-costa is a short vein passing obliquely forwards at 

 an acute angle to the costal margin, and cutting ofi a triangu- 

 lar costal held. The sub-costal vein is small, and breaks up 

 into three branches, the first forking twice into three twigs, 

 the second giving off two undivided twigs and then forking, 

 whilst the third is long and remains undivided. The costal 

 field occupies about one-third of the outer margin, and is 

 triangular, being especially wide at the base. The character 

 of the sub-costa, and the shape of the costal area are typically 

 Necymylacrid. The radius is a large much divided vein, 

 occupying the outer two-thirds of the costal margin, and reach- 

 ing almost to the middle of the tip of the wing. It divides 

 near the base into two main branches, both of which repeatedly 

 fork, ultimately forming ten twigs each, so that the radius 

 ends upon the margin in twenty twigs. The median vein with 

 its sub-divisions lies along the middle of the wing, and ends 

 upon its apex. Owing to the venation of the hind wing having 

 become impressed upon the forewing, the ultimate branching 

 of the median is very difficult to trace. The basal half of the 

 vein is fairly clear, and it is possible to distinguish that it 

 bends inwards along its course to the inner side of the wing 

 apex, apparently giving off three branches, which pass straight 

 out to the wing apex. The outer of the three branches seems 

 to fork once, and the next, twice, so that the branch ends in 

 three twigs. The third branch forks into two equal-sized twigs. 



The cubitus is a large vein, going in a long concave sweep 

 from the base of the wing to the inward side of the wing apex. 

 It gives off eight branches on its inner side, all of which divide, 

 except the fifth and eighth. These all pass off obliquely from 

 the main stem, the first, second, and third, forking several 

 times, whilst the fourth, sixth, and seventh, fork once only. 

 The whole of the inner margin of the wing beyond the anal 

 area is occupied by these divisions of the cubitus. The anal 

 area is large, and crossed by about eight-ten veins, two of which 

 fork. The inner margin appears to have been more straight 

 than rounded. 



Riglit tegmen. — The basal portion of the right fore wing 

 being broken away, the course of only the distal divisions of 

 the veins can be distinguished. These are substantially simi- 



