76 THE CANADIAN ENTOMOLOGIST 



exposure to destroy the eggs. The results obtahied from this 

 treatment were \ery gratifying — the bedl)ugs in all stages were 

 wholly eradicated and the house furniture was not damaged in 

 the slightest degree. 



It is more than probable that the above noted temperatures 

 were unnecessarily high, and that the superheating would have 

 been equally effective if the temperature had been maintained 

 between 120 F. and 130 F. 



SUNFLOWER INSECTS IN CALIF^ORNIA AND SOUTH 



AFRICA. 



BV T. D. A. COCKERELL, BOULDER, COLORADO. 



On August 16th, 1915, I had an opportunity to collect and 

 study the insects on Helianthits lenticulan's, the common wild 

 sunflower, at Orange, California. The plants grow commonly by 

 the roadside, where, at this season of the year, they are practically 

 the only wild Howers to be seen. I was unable to find any char- 

 acters on which to separate the Californian Sunflower from that 

 of Colorado. There was a good deal of \ariability, thus three 

 plants growing close together showed: 



(a). Rays 20, short and broad, obtise, 34 mm. long, 14 broad, 

 light orange, suffusedly deeper basally. 



(b). Rays 21, acute, 29 mm. long, 7.5 broad, coloured nearly 

 as in a. 



(c). Ra>s 18, long, length 40 mm., widlli 9.5, entircK' uniform 

 deep orange. No wuld //. leniicularis was noticed l)etween San 

 Francisco and Santa Barbara, but the plant was abundant by 

 roadsides in the region round Los Angeles, and also about culti- 

 vated fields in the San Diego region. 



The object of my investigations was in part to determine, if 

 possible, whether //. lenticulan's was really a native of California. 

 On reviewing the insect fauna, it appears to show less special 

 adaptation than that on the Rockv' Mountain sunflowers, and 

 tends to support the view that the species has been introduced. 



The sunflower fauna at Orange, as obtained on August 16th 

 was as follows : 



Hymenoptera 



Ilalictiis armaticeps Cresson. Six females, collecting pollen. 



Halictiis nevadensis Crawford. Three females. 



March, 1916 



