Studies of the Development of Fidia viticida Walsh. 163 



prominent, roughened and broadly obtusely bifid immediately 

 above the base of the mandible, the outer tooth being the 

 smaller, and between it and the larger arises a stout bristle, 

 while others are placed distantly along the crest of the ridge. 

 Mandible, b, Fig. 1, PI. IX, with a broad obtuse tooth on the 

 inner edge toward the tip. The labrum is provided with a 

 stout bristle about midway between the center and the lateral 

 margin, with a closely placed row around the frontal edge, 

 these last being usually broken off in full grown specimens. 

 The somewhat peculiar antenna, c, Fig. 1, PI. IX, is four 

 jointed, the basal being shorter and slightly more robust than 

 the second, from which it is rather indistinctly separated, the 

 third is still smaller, the fourth being of two parts, the outer 

 cylindrical and surmounted by three bristles, wdiile the inner 

 is nearly the form of a right-angled triangle, with the per- 

 pendicular innermost, the hypotenuse facing the cylindrical 

 portion and having a somewhat scoop-shaped appearance. 

 Labium thick and trilobed, the outer lobes covered on the 

 upper surfaces with minute, spinular scales; palpi,/, Fig. 1, 

 PI. IX, rather slender, cylindrical, slightly curved and ter- 

 minating with a single bristle. Maxillae, e, Fig. 1, PI. IX, 

 well developed, with the inner lobe armed with stout spines, 

 the outer lobe prominent and four jointed. 



Pupa: B, Fig. 1, PI. IX. Length, 6. to 8. mm. Color, 

 white, with pinkish tinge about head, thorax and posterior 

 extremity ; head with a semi-circular row of four spines, the 

 frontal pair erect, the other two smaller and divergent ; near 

 anterior margin of thorax there is a similar row, likewise 

 placed in the form of a semi-circle, while just behind these is 

 a cluster of four smaller and more erect bristles placed in 

 pairs, the anterior of these being the most widely separated. 

 Anterior femora armed at tip with a short, hooked spine, 

 while above and at one side is a single, straight spine ter- 

 minating in a bristle, posterior femora armed with a stouter 

 hook and two stouter erect spinular bristles, middle femora 

 unarmed; at posterior extremity are two stout, flattened 

 hooks, whose points extend upward ; on the dorsum of the 

 penultimate segment is a row of four distantly-placed decum- 

 bent spines, while on the preceding segment is a median, 

 transverse, closely-placed row of four stout, erect spines, each 



