302 ENTOMOLOGICAL NEWS. [July, 'l 5 



the base of each mandible is armed with small spinules. Near the mid- 

 dle of the ventral face is a row or group of about ten setae. 



Maxillae similar to those of Cora,i the attenuate tip of the inner 

 lobe with one immovable tooth and two more proximal movable spines. 

 There is a membranous supralingua between each maxilla and the 

 hypopharynx proper, not visible in the exuviae. 



Labium (PI. XI, figs. 6, 8) when at rest reaching caudad to the level 

 of the bases of the prothoracic legs but not as far as that of the hind 

 ventral prothoracic margin. Median (mental) lobe with the distal 

 margin 1.2 times as wide as its mid-longitudinal length, produced dis- 

 tinctly distad in the middle and there bilobulate, but the emargination 

 which separates the lobules not reaching proximad as far as the level 

 of attachment of the lateral labial lobes ; a minute tooth on the inner 

 dorsal surface of each lobule a short distance within (proximal to) the 

 distal margin and a greater distance from the median line; this is t* of 

 the larva of Cora as shown in fig. 28, pi. Ill, /. c, and the "pronounced 

 tooth ... on the sutural line" of the labium of larval Lestes 

 ( Butler) + ; distal margin minutely crenulate for its entire length, a 

 very short seta between each crenulation and the next, lateral margins 

 spinulose near the articulations of the lateral labial lobes; mental setae 

 usually absent, but two pairs of short setae have been observed 

 on each side of and near the emargination separating the two lobules 

 of the distal margin. Lateral labial lobes spinulose laterad near base, 

 without setae, each with a long curved tapering terminal spine ("mov- 

 able hook") and two stout distal teeth, both shorter than the terminal 

 spine, the inner (mesal) of the two longer than the other; three distal 

 teeth exist in the larva of Cora, the most internal of which appears to 

 be absent in Thaumatoneura. 



Dorsal surface of prothorax sharply defined on all sides by a carina 

 having a hexagonal outline (counting the curved anterior and posterior 

 edges as but one each). Propleuron bounded inferiorly by a carina 

 ending anteriorly in a spinulose tubercle. Mesostigmata very distinct, 

 on transverse tubercles, open in larva No. 4 and probably in the 

 exuviae, not open in the other larvae. Mesopleuron with a marginal 

 carina. Metastigmata indicated, small, apparently not open. 



Legs moderately long, moderately slender, each coxa with a superior 

 spinulose tubercle, three tarsal joints, two curved simple tarsal claws, 

 empodium present. 



Abdomen triangular in cross-section, but the mid-dorsal angle 



rounded, each segment wider than high; of 10 complete segments 



which decrease in width very gradually and slightly from i to 5, more 



markedly from 6 to 9. Segment i with a short transverse row of setae 

 » 



tL. c. p. 53, pi. Ill, figs. 29, 31. 



tTrans. Amer. Ent. Soc, xxx, p. 114, 1904. 



