The Basal Sclerites of the Leg in Insects. 15 



detached distal portion of the trochantiu inl (of Fig. 1), he designates 

 as he entire trochantin. Veehoeff, 1902. and Snodgrass, 1908 — 1909, 

 have followed Sharp in designating the detached distal portion of 

 the trochantin, inl (Fig. 1) as the entire trochantin, in the prothorax 

 of the roach, but they regard the basal region of the trochantin U 

 (Fig. 1) as a portion of the episternum, instead of interpreting it 

 as the epimeron (as was done by Sharp). A carefnl stndy of the 

 trochantin in all three thoracic segments, however, clearly shows 

 that the region U (Fig. 1) is the basal portion of the prothoracic 

 trochantin, and that the plate tnl (Fig. 1) is the detaclied distal 

 portion of the trochantin, instead of being the entire trochantin, as 

 others would interpret it. 



Audouin's erroneous statement that the trochantin articulates 

 with the epimeron (instead of articulating with the episternum, as 

 is actually the case) and the fact that Audouin, 1824, labeled the 

 posterior region of the metathoracic coxa as the ''trochantine", in his 

 figure of the sclerites of Dijtiscus, is apparently responsible for the 

 mistaken designation of the posterior portion of the metathoracic coxa 

 {m, of Fig. 24, of the present paper) as the "trochantin", by Comstock, 

 1913, in his fig. 611 of the beetle Enchroma. The same misleading 

 statement of Audouin's is apparently responsible for the fact that 

 Packard, 1898, designates the meron of the meso- and metathoracic 

 coxae as the "trochantine", in his fig. 90, of the thorax of the moth 

 TeUa, 'although Packard may have been influenced in this matter, 

 by the fact that Westwood, 1832, in his figure of Telea (tab. 121) 

 designates the meron of this insect as the "trochantine". 



In his fig. 89 of Melanoplus, Packard designates the posterior 

 portion of the pro- and mesothoracic coxae as the "trochantine", 

 and likewise applies the term trochantine to the membranous region 

 between the true coxa (called the "trochanter" by Packard) and 

 the pleural region, in the metathorax of this insect. It is unfortu- 

 nate that this misinterpretation of the sclerites has not been noted 

 or rectified before, since Packard's figure of the grasshopper has 

 been widely adopted, to illustrate the anatomy of this insect. 



Newport, 1839, applied the term trochantin, to the anterior 

 portion of the coxa (or to the veracoxa, vc, when the latter is 

 clearly marked off from the remainder of the coxa), and restricts 

 the designation coxa, to the posterior portion of the coxa (or to the 

 meron, when the latter is clearly demarked from the remainder of 

 the coxa). Packard, 1883, was apparently influenced by Newport's 



