463 



Aprosihena zabriskei, Webster and Mally (purslane sawfly), which 

 deposits eggs in the edges of the leaves from June to September, there 

 being apparently several generations. One larval parasite, 

 Ichneutidea secunda, was reared from this species, and two egg- parasites, 

 Anaphoidea conotracheli, Gir., and Achrysocliaris kansensis, Gir., which 

 emerged in July. Bruchus cruentatus, Horn (partridge-pea weevil) 

 was found in the seed pods in autumn. Petalostemum pupureum (prairie 

 clover) is infested by Apian varicorne (prairie clover weevil), which 

 was observed in June and again in August ; pupation took place on 

 17th August, adults emerging on the 24th. This species is also recorded 

 on the flowers of huckleberry and the flower-heads of Perosela aurea. 



Insects on Astragalus canadensis (milk vetch) include Bruchus schran- 

 kiae, Horn, which hibernates in the larval stage in the pods, the first 

 adults appearing in early July. There are probably two broods. 

 Tychius aratus, Say, (milk vetch weevil) appears not to have 

 been recorded from any food-plant before. Oviposition in the 

 pods occurred in early July, pupation in early September and by the 

 end of the month adults were emerging. A Phycid moth was 

 found in early July in the larval stage tying the leaves to the immature 

 pods. One adult appeared on 15th July. Phorbia sp. is abundant on 

 the pods at the end of August, the larvae being voracious feeders. 

 These insects keep this noxious weed entirel)^ in control. 



Oenothera biennis (evening primrose) is one of the food-plants of the 

 weevil, Tyloderma foveolata, Say, which has been recorded as seriously 

 injuring strawberries in British Columbia. Oviposition occurs early 

 in June, on the stem, where a scar is left. All stages may be found 

 throughout the summer ; pupae were found in late August in the stem, 

 whence adults emerged in a few days. There is one generation in a 

 year, hibernation being in the adult stage. Mompha steUella, Busck 

 (evening primrose bud caterpillar), works into the buds in July and 

 August, and pupates for three or four weeks, adults emerging early in 

 September. Phalonia oenotherana, Riley (evening primrose leaf- worm) 

 is found in the terminal leaves. An adult moth was reared on 24th July. 

 Asclepias syrinca (milkweed) harbours Rhyssomatus lineaticollis, 

 Say (milkweed weevil), which oviposits at the end of June, making 

 long gashes in the stem ; the larvae enter the soil to pupate at the 

 end of August. Plutdla macidipennis. Curt., was found pupating on 

 the terminal leaves, one adult emerging on 7th August. This species 

 is a minor pest of cabbage. Anosia plexippus, L. (milkweed butterfly) 

 is found in the larval stage on the underside of the leaves during 

 summer. Physalis (ground cherry) is a host of Letna trilineata (three- 

 lined leaf-beetle), which is a pest of potatoes. The beetles oviposit 

 under the leaves of the ground cherry during June. One larva was 

 observed to pupate in early July, the adult emerging on 27th July. 

 There are probably tw^o broods. Verbascum thapsus (mullein) is 

 frequently badly infested with Gymnetron tetrum, F. (mullein weevil), 

 the larv^ae feeding in the seed pods. Insects on Solidago canadensis 

 (golden-rod) include the Chrysomelid, Trirhabda canadensis, Kirby, 

 the larvae of which are very abimdant on the leaves in June. Pupation 

 took place in the breeding cage in early July, just below the surface 

 of the soil, adults emerging in nine days. Agromyza posticata, Mg. 

 (golden-rod leaf-miner) blacken the leaf-tips ; the larvae pupated late 

 in June, adults emerging in about three weeks. Silphium perfoliatum, 



