20 Psyche [February 



oval, prominence which bears long black hairs. The chitinous portions of the pro- 

 thorax are black or dark brown with several lighter areas which bear tufts of long 

 black hairs. Ventral side of the prothorax mostly white and unchitinized, except 

 for a narrow median strip which projects backward between the coxte of the meso- 

 thorax. A narrow chitinous plate projects obliquelj' upward and forward from each 

 front coxa and bears a tuft of long black hairs. The meso- and metathorax are black 

 with narrow borders of lighter color along the sutures. The abdomen has three 

 narrow black lateral hnes, the middle one narrowest and extending only as far for- 

 ward as the second segment; above and below these lines the color is dark brown, 

 below them it is lighter. One or two gill-like processes, some of which bear black 

 hairs, project from the sides of each of the first five abdominal sutures. The femur, 

 trochanter and tarsus of each leg is rather densely clothed with short black hair. 

 Each fore coxa has two parallel rows of black hairs between which the femur fits 

 when the leg is folded. Each of the two succeeding coxae is provided with a single 

 row of long hairs. For details of the genitalia consult Figs. 2, 3, 4, 5, and 6. 



Larva: Length 18-20 mm., width .3 mm. Color of chitinous portions of head 

 and thorax black when viewed with reflected light, when viewed with transmitted 

 light mounted specimens show faintly lighter markings. The legs are black, ringed 

 with white. Fleshy portions of prothorax and abdomen are pale brownish white. 

 The anal hooks are brown. 



The Head is narrowest at its anterior end and broadens very gradually to near 

 its base where it narrows. Behind the place of its greatest diameter it is inclosed 

 within the first thoracic segment. The distribution of setae on the dorsal surface 

 is shown in Fig. 7. The frons. Fig. 15, has a semicircular line of setae curving 

 away from the cephalic margin and three other, more, widely separated setae near 

 each side. Like the hea\'ily chitinized portions of the head and thorax, the frons is 

 thickly marked by minute transverse lines from each of which arise several very 

 minute hairs, giving except under high power, a somewhat scale-like appearance. 

 The mandibles. Fig. 2 are deeply grooved along their inner margin to the very tip 

 of the apical tooth. Besides the apical tooth, two lateral teeth are present on each 

 edge of the groove. From the groove arise three well-defined brushes of hair. 

 The inner brush is directed inward and backward; the middle and cephalic brushes 

 are directed inward and toward the front; the cephalic brush is the most dense and 

 is composed of extremely fine hairs. The labrum, Fig. 9, is crossed by a row of 

 18-20 strong setae whose bases almost touch, except on the median line, where there 

 is a greater space. On each latero-anterior angle there is a patch of long fine hairs 

 and in the middle of the cephalic margin a dense line of short hairs. 



The Thorax: Prothorax heavily chitinized above and on the sides. The area 

 between and in back of the coxal cavities is membraneous, except two narrow spots 

 immediately in front of the mesothorax. Mesothorax with a chitinous area which 

 extends back over the metathorax as far as the caudal margin of the hind coxae. 

 Within this area there is a well-defined square bearing eight setae. Fig. 7. The 

 sides are not chitinous, except for a small black triangle behind each coxa, which 

 bears a circle of about twelve setae; the venter is free from heavy chitin, except for 

 two narrow yellow spots on the caudal margin. The metathorax is without heavy 

 chitin above. On the sides the distribution of chitinous plates is the same as on 



