PROCEEDINGS, 1917. 11 



the month of September. There are specimens in the collection from Truro, Wilmot, 

 Yarmouth and Deerfield. 



The genus Publilia Stal. 



Publilia concava Say (Plate 4) the only species belonging to this genus in Nova 

 Scotia may be distinguished from the preceding species, which is the only one with 

 which it is likely to be confused, by the slight dorsal depression instead of the deep me- 

 dian notch which marks that species. This character is well shown in Plate 1, fig. 6. 



Since the life history does not appear to have been worked out or the immature 

 stages described, the results of our work on these points are here given. The eggs of 

 this species are laid in a double row on the midribs of the golden rod on the underside. 

 They were noted very commonly in the vicinity of Truro on July 1st and later during the 

 summer of 1917. Numerous adults were also noted in copula on that date. The adults 

 remain near the eggs for days and even weeks after the first lot of eggs are laid and usu- 

 ally several batches are deposited in the same midrib. The males disappear before the 

 females. 



The first eggs were noticed hatching on July 21st and the adults began to appear 

 towards the latter part of August. Observations ta'.ten in the insectary showed that 

 the average duration of the different instars was between five and six days, the adult 

 stage being reached in about three wee.-.s after hatching. There is only one brood and 

 the insect hibernates as an adult. 



Life Stages of Publilia concava Say. 



Egg. Smooth and cylindrical, slightly curved, widest three fourths of total length 

 from anterior end, which is rather sharply rounded; posterior extremity more bluntly 

 rounded. Chorion, smooth, shiny, only slightly sculptured. General color, white v^ith 

 slight yellowish tinge. Length, .8 mm; width, .28 mm. 



First Instar. — Body, small; arched; long; narrow; widest at head; sides of thorax 

 nearly parallel; abdomen widest at second segment, narrowing gradually to anal tube. 

 Prominent fleshy tuberosities, terminating in a single long stout spine, situated on 

 either side of the median line of several segments. Head, large; mouth parts extend- 

 ing backward along venter, fringed with long stout spines, regularly placed and a num- 

 ber of smaller hairs; antennae, short; fine; wider at base but tapering to a very fine 

 point at the top; devoid of hairs. Eyes, placed on side near ventral margin. Protho- 

 rax, rounded above, forming a slight protuberance set with spines; equal in width 

 and almost as long as the head. Mesothorax, with dorsal tuberosities, shorter than 

 prothorax. Metathorax, shorter than mesothorax, no tuberosities but dorsal surface 

 beset with stout spines. Abdomen, with double row of spines on ventral and lateral 

 surfaces, with circlet around anal orifice. Dorsal surface of all but first segment with 

 tuberosities. Legs, hairy. Color. Head and covering hairs black. Antennae, light, 

 except at tips which are darker in color. Eyes red. Thorax and abdomen dar reddish 

 brown, colorless at segment margins; terminal abdominal segment except at tip darker 

 in color than the remainder. Legs hyaline. Length, .832 mm.; width of head .55 mm.; 

 width of abdomen. 33 mm. -.35 mm. 



Second Instar. — Body larger, stouter and more strongly arched than preceding 

 instar. The tuberosities are relatively stouter and larger and are provided with short 

 stout spines. Head, narrow at dorsal margin, widening ventrally. Prothorax, with 

 pronounced dorsal proturberance, set with strong spines; wide at the apex, tapering 

 strongly towards the ventral margin. Mesothorax, and Metathorax narrow; meso- 

 thoracic tuberosities complex. Abdomen, curved dorsally, tuberosities directed back- 

 ward, body hairs more numerous. Color. Head and greater part of thorax and ab- 

 domen black, with prominent yellow areas on thorax and abdomen. Mesothoracic 



