1917] Notes on Coccinellid Genus Adalia Mulsant 299 



(5) In melanopleura, coloradensis and bipiinctata there were 

 discovered variations in the markings of the pronotum, viz. : 

 in all these forms the lateral dot may be either present or absent. 

 So melanopleura with the white area on the pronotum are not 

 necessarily melanopleura-coloradensis hybrids as supposed in 

 the paper of 1911 or melanopleura-hipunctata, as might be 

 expected. Vice versa, since bipunctata sometimes possess the 

 lateral dot it would not be surprising to find melanopleura- 

 hipunctata hybrids bearing it and so not differing in appearance 

 from typical melario pleura. The lateral dot in coloradensis 

 being differently placed and not coinciding with the regular 

 dot, the white area would be expected to appear in the hybrid. 



In melanopleura the presence of the lateral dot is infinitely 

 the more common form, in coloradensis it seems to be rather 

 uncommon, and in bipunctata it is extremely rare. 



In 1914 a second article was published by the writer in the 

 Annals of the Ent. Soc. of Am. entitled "Some Notes on Life 

 History of Ladybeetles. " As the writer had -not then taken 

 bipunctata in Colorado, it was not included in those experiments. 

 In order to complete this record a few life history notes were 

 taken on this species in connection with the foregoing experi- 

 ments. 



Life cycle records were taken as follows: 



Egg stage (6 records) 3-7 days. 



Larva stage (2 records) 9-10 days (in hot weather). 

 Pupa stage (2 records) 4-5 days (in hot weather). 

 Egg to adult 16-30 days. 



Adult Stage ; no records taken except on hibernating beetles, 

 a number of which lived and mated and laid eggs in the labora- 

 tory until August 1,5, when the experiment was discontinued 

 and they were killed and pinned up. Judging from this the 

 hibernating form must be able to Hve 12 months more or less. 

 The life cycle records vary greatly according to the temperature 

 of the weather. In the spring each stage took about twice as 

 long as in the warmest part of the summer with the thermometer 

 from 87 to 93 degrees. 



One satisfactory egg record was taken and in 3 months and 

 15 days this female laid 1,180 eggs. The beetles laid from 12 

 to 35 eggs in a patch and would sometimes lay 2 patches a day 

 and would also often skip several days and then lay again. 



