182 Transactions of the Society. 



the line of coalescence, and the convex anterior margin of the 

 abdomen resembles one of the trefoils found in Gothic ecclesiastical 

 windows. Each half of the tectum slopes upward from the cepha- 

 lothorax, so as to stand very clear, and is prolonged into two 

 great, chitinous, curved horns, or rather pointed blades, which 

 extend as far as the tip of the rostrum, the outer (Fig. 1, a) 

 being slightly the longest ; between the two is a deep, wide inden- 

 tation, concave posteriorly, so that each half of the tectum reminds 

 one of an old-fashioned bootjack ; from the centre of each concavity 

 proceeds a strong, rough spine (Fig. 1, c), extending horizontally 

 forward far beyond the rostrum. The usual interstigmatic hairs 

 (Fig. 1, e) are in this species, two similar spines, even longer and 

 stronger than those of the tectum, extending from the margin of 

 the abdomen nearly as far as, and lying just inside, the tectum 

 spines. Below the tectum, on each side, a broad, blade-like ridge 

 (Fig. 1,/), standing on edge, is attached by its lower edge along 

 the cephalothorax, its anterior portion being free and cut into three 

 serrations. From the hood of the cephalothorax, immediately under 

 the last-named blade-like ridge, so that it seems to spring from the 

 ridge itself, arises a long curved spine (Fig. 8, c), at a lower level 

 than the tectum and interstigmatic spines ; the two curved spines 

 cross under the others nearly at a right angle and almost meet ; 

 these curved spines are very strongly pectinated on the outer edge, 

 but nearly smooth on the inner edge. 



Two great curved partitions (Fig. 1, g), attached to the cephalo- 

 thorax below, enclose spaces, open in front and above, closed 

 posteriorly and below, which receive the front pair of legs, and 

 appear as though they were unnecessarily large and long for the 

 purpose ; the partitions have a curious horseshoe-shaped mark on 

 the under side ; the stigmata are sunk in the posterior angles of 

 these spaces, and the stigmatic hairs, which are long, falciform, and 

 rough, extend horizontally above them. The legs are thin, the two 

 front ones have the coxae turned almost at right angles, those of 

 the two hind pairs and the trochanters of the fourth pair are broad 

 and flattened. The third and fourth joints of the first two pairs of 

 legs, and the fourth joints of the fourth pair, bear short, stout, 

 rough spines, all the tarsi are clothed with long, fine hairs, and the 

 fourth joint of the first pair bears the usual long, fine hair. 



The abdomen has the wing-hke expansions (Fig. 1, h) large 

 and extending far back, deeply sinuated on the anterior margin to 

 give play to the second pair of legs ; this margin is marked with 

 several fine lines or wrinkles. From the angle of the lateral 

 and anterior margins of the abdomen, immediately outside the 

 stigma, a strong, chitinous apophysis curves inward round the air- 

 sac, and showing through, in consequence of the transparency of 

 the dorsal plate in this place, looks like an expansion of the ridge 



