418 SYNOPTIC COLLECTION. 



tremely interesting to note that before the first moult this 

 insect has the power of leaping several inches l but after 

 this moult it is more sluggish. Living and burrowing in 

 the earth, there is no need of leaping legs, and therefore 

 these have become essentially like the second pair. 



The habit of excavating tunnels while in search of 

 food has modified the forward legs into powerful digging 

 implements which are seen in the mature larva as well as 

 in the adult. This same habit has produced a similar 

 structure in the mole of the Mammalia. 



Although these crickets do not possess the power of 

 leaping in the adult stage, they can swim, and, according 

 to Fletcher, 2 "their little shining black eyes, velvety coats 

 and flexible bodies recall strongly the appearance of the 

 otter particularly when emerging from the water or crawl- 

 ing over stones." 



Order 8. THYSANOPTERA. 



The larva (PI. 1033, Parthenothrips dracaenae Heeg) 

 of the Thysanoptera has the general features of the Thy- 

 sanura. These are seen still more plainly in Limothrips 

 (= Thrips) tritici Fitch (PI. 1034, fig. i). The pupa 

 (PI. 1033, fig. 2), however, and especially the adult 

 (PL 1033, fig. 3, and PL 1034, figs. 2, 3) are farther 

 removed from their own larvae than the adults of the 

 Euplexoptera or the Orthoptera. The mouth parts (PL 

 1035, fig. i) have become modified for sucking. There are 

 still three pairs of these organs and the labrum (fig. 2, a) 

 but the mandibles (fig. 2, b} are more like the bristles of 

 the Hemiptera, the next order to be described, than the 

 horny teeth of the Orthoptera. The first pair of maxillae 

 (fig. 2, c) and the maxillae of the second pair, which 



1 Doran, Can. Ent., XXIV, 1892, p. 271. 



2 Can. Ent., XXIV, 1892, p. 25. 



