56 Trans. Acad, of St. Louis 



exception. With the dock thus gone, the beetles had mi- 

 grated to the nearby pig-weed, milk-weed and pepper- 

 grass, but many still clung tenaceously to the mid-ribs of 

 their favorite, the dock. 



A few batches of eggs laid in the laboratory hatched in 

 six days. The pupae transformed in the earth lyo 

 inches below the surface, in a little smoothly-lined bur- 

 row without an opening. 



Trirhabda canadensis Kirby. [E. A. Schwarz]. These 

 beetles were abundant on the resin-weeds at Wickes, 

 June 16, 1917. The fact that portions had been eaten 

 from the weeds in so many places led us to suspect that 

 the adults fed on this plant. 



Diabrotica 12-punctata x D. vittata. Between Sep- 

 tember 4 and 14, 1912, seven cases of mating between the 

 two species were observed in the pumpkin-blossoms. In 

 every case, the male was the striped beetle, D. vittata, 

 and the female the spotted variety, D. 12-punctata. One 

 pair was observed in copulo for one-half hour continu- 

 ously ; they were then disturbed when being placed in the 

 bottle, but later in the day they re-united for another 

 hour and a quarter. 



Haltica bimarginata Say. [E. A. Schwarz]. Feeding 

 on the leaves of a willow sprout October 3, 1917. 



Blepharida rhois Frost. [H. S. Barber]. This beetle 

 was found dead in a sumac stem in January. From the 

 position it was evident that it had crept into the hole for 

 shelter and died. 



Synchroa punctata Newm. [H. S. Barber]. These 

 pupae were taken from under the bark of a rotten log on 

 May 11. The adults emerged the next day. 



Nacerdes inclanura Linn. [E. A. Schwarz]. Many 

 were seen in St. Louis in the first week of June, 1915. 



Nemognatha lutea. [E. A. Schwarz]. These were 

 abundant in July on the blossoms of the sunflower, and 

 seldom flew from plant to plant. They could easily be 

 picked up from the flower; they practiced no dropping 



