179 



Apocynum androsamifolium, and especially upon the under surface 

 of the leaves of this plant. A single egg is deposited within a conical 

 black mass, which is probably the excrement of the beetle. To this 

 note Beutenmiiller adds that "the larvae, after hatching drop to the 

 ground and live on the roots of the plant." 



With so much of a clue, the complete life history of this species 

 ought to be worked out without much difficulty. Forbes once re- 

 ported this species injuring potato (Lintner, Fourth Report on the 

 Injurious and other Insects of the State of New York, p. 142). 



Nodonota convexa Say. 



This sm'all leaf -beetle was taken in sweepings of vegetation in a 

 colony of the cone-flower, Lepachys pinnata (Sta. l,e), Aug. 12 

 (No. 40). Blatchley ('10, p. 1149) states that it occurs in low- 

 places on ragweed. Ambrosia trifida. This cone-flower colony was 

 on rather low land containing crawfish holes. 



Trirhabda tomentosa Linn. 



This insect was taken at Station I by T. L. Hankinson July 3, 

 191 1 (No. 7665). It is common on Solidago. Schwarz (Am. Nat., 

 Vol. 17, p. 1289. 1883) reports it as a defoliator of prickly ash 



(Zanthoxylum) . 



Diabrotica 12-punctata Oliv. Southern Corn Root- worm. (PI. 

 XLV, fig. 3). 

 This common corn pest was taken in sweepings of the vegetation 

 in a colony of Lepachys pinnata (Sta. I, e) Aug. 12 (No. 40), and 

 T. L. Hankinson captured it (Sta. I) July 3, 1911 (No. 7665). A 

 few feet away was a large corn field. It was also taken on the 

 flowers of Bryngium yuccifolium on the prairie at Loxa (Sta. II) 

 Aug. 13 (No. 55). Here also a field of corn stood only a few feet 

 away. 



Diabrotica longicornis Say. Western Corn Root-worm. (PI. XLV, 

 fig. I.) 



This beetle was found upon the flower-masses of the mountain 

 mint Pycnanthemum pilosum, growing in a forest clearing (near 

 Sta. IV, a) Aug. 23 (No. 146). It feeds upon the silk and pollen 

 cf corn, and probably on the corresponding parts of other plants. 



Diabrotica atripennis Say. 



One specimen of this beetle was taken on the flowers of the 

 swamp milkweed, Asclepias incarnata (Sta. l,d), Aug. 8 (No. i). 

 Very little appears to be recorded on this species except that it feeds 

 upon the pollen and silk of corn, the pollen of composites, and the 

 blossoms of beans (Forbes, '05, p. 189). 



