166 EXPERIMENT STATION RECORD. 



good. Another mixture was composed of 4 cwt. of kainit, 2 cwt. sul- 

 phate iron, and 3 cwt. superphosphate. For oats 5 cwt. kainit, \.\ cut. 

 sulphate of ammonia, and 1 cwt. sulphate of iron, also 2 cwt. sulphate 

 of potash, 2 cwt. sulphate of iron, 3 cwt. nitrate of soda, and 1 cwt. 

 sulphate of potash are said to have given good results. For onions 

 the best mixture is thought to be sulphate of potash, sulphate of iron, 

 and nitrate of soda, mixed at the rate of 2 cwt. each per acre. 



Natural history of the genus Chrysopa, Leach, M. Lurie (Abs. 

 in Zool. Centbl., 5 {1898), No. 10. pp. 335, 3SH).— The original is in Rus- 

 sian. The author arrives at the conclusion that the laying of eggs by 

 the lace-winged ny at the end of a long stalk is for protection rather 

 than for accelerating the development of the egg. The period of the 

 egg state is constant for each species. In the larva of Chrysopa ven- 

 tralis a dorsal shield serves as a protection against parasitic Hyrnenop- 

 tera. The larva* of G. septempunetata molts on the fourth and seventh 

 day after leaving the egg, and probably also a third time. When the 

 time for pupation is near the larva first spins a sort of cover with a 

 thread from an anal gland, then lies on its back and spins a web beneath 

 it. When the cocoon has become thick the larva rolls itself up and 

 ceases spinning. 



The substance used in the formation of the cocoon, the author states, 

 is derived from the upper fringe of Malpighian vessels. The cell nuclei 

 of these undergo changes during the process of secreting. Formerly 

 round, they become oblong, and at the completion of the process they 

 assume a peculiar branched form. In C. vulgaris there is a double gen- 

 eration. There is in the vicinity of Warsaw, however, but one. The 

 pupal state lasts six months, the larval over five, the egg state several 

 days, and the number of eggs reaches sixt}'. 



Besides the general biology the author also studied the anatomy of 

 the insect. The mandibles recall those of the ant-lion larva. 



How flowers attract insects, P. Kxuth (Bot. Centbl., ',4 (1898), Xo. 2, pp. 39-46: 

 abs. in Zool. Centbl., 5 (1898), Xo. 10, pp. 331, 332). — The author considers Plateau's 

 conclusions (E. S. E., 9, p. 158) on this subject as imperfect. The odor of flowers is 

 thought to attract until the insect is within 1 or 2 meters, when sight is thought to 

 be the chief guide 



Catalogue of the Odonata of Ohio, I). S. Kellhott (Jour. Cincinnati Soc. Nat. 

 Hist., 19 (1897), Xo. 2, pp. 66-71). — Thirteen species are noted here. 



Orthopterological notes. I, On the development of the wings in the genus 

 Nemobius ; II, Parthenogenesis and parasitism in Bacillus gallicus, J. Domi- 

 nique (Bui. Soc. Set. Nat. Guest France, 7 (1897), pp. 265-271; abs. in Zool. Centbl., 5 

 (1898), Xo. 7, p. 230). — The eggs of the second generation of Bacillus gallicus in the 

 cases investigated developed but few larva' and all of these turned out to be females. 



Three new species of Chrysopidae, N. BANKS (I'roc. lint. Soc. Washington, 4 

 (1S97), Xo. 2, pp. 173-175). — Chrysopa sabulosa, C. fraterna, and Leucochrysa ameri- 

 cana. The first and second from Fort Collins, Colorado, and the third from Auburn, 

 Alabama. 



The species of Pepsis inhabiting America north of Mexico, W. .1. Fox (Proc. 

 Ent. Soc. Washington, 4 (1897), Xo. 2, pp. 140-148). — Four new species, Pepsis (Areo- 

 laris, P. lucasii, P. inertnis, and P. boguei are described. 



