59 



* 830. Felix Plateau. Note sur une Sdcr^tion propre 

 aux Col^opt^res Dytiscides. p. 1-10. [Se})t., 1876.] 



Some Dytiscids emit a milky liquid from between the head and dorsal 

 region of the prothorax, and an entirely different yellowish liquid from 

 between the mesothorax and metathorax. These liquids are examined 

 physically and chemically; the milky liquid compared with the blood and 

 as to its action npon other animals. " The milky liquid is the product of 

 unicellular cutaneous glandules ; is a special liquid and not the blood of the 

 insect; probably does not serve to determine the approach of the sexes ; 

 does not act at all as a poison upon other insects ; cannot be a means of 

 defence; does not serve to form a fatty coating upon the surface of the 

 body." 



* 831. Baron MaximiliexV uk Chaudoir. Monographie 

 des Brachynides. p. 11-104. [Sept., 1876.] 



[The author leaves out of this work the Brachynus of the U. S. (for 

 which see Rev. et Mag. Zool., 18G8) and of some other countries.] Notes 

 and synonymy of many species ; descriptions of new species and genera. 

 Nos. 57-64, 68, 82, 83, 85, 88 of Brachynus = 14 Mexican spp., of Aviiich 

 B. elongatulus, B. azureif tennis, B. ritytklerus, B. consanf/uineus, B. nielan- 

 arlhrus, B . Sallel seem to be new. Alphabetic table of genera and species. 

 [See T. xviii, Compt.-rend., p. ii-iv.] 



* 832. Jules Lichtekstein. Notes pour servir a I'His- 

 toire des Iiisectes du Groupe des Pliylloxerieus, Homopteres 

 formant la transition des Apliidiens aux Coccidiens. p. 164— 

 177. [Febr., 1877.] 



Systematic position of thi Horaoptera Anthogenesia [Phylloxeridae], 

 combining the characters of Aphidae and Coccidae, and divided into the 

 genera Acanthocliermes, Phylloxera and Rhizaphis. The development of 

 Rhizaphis vaslalrix is comj>ared to that of a vegetal as follows: "In the 

 spring, there is an egg under the bark of the vines; that is the seed. This 

 egg hatches and li-om it issues a little a[)hid who is to become the motiier 

 founilress of tiie colony. This is the stem of the family. This mother la}S 

 numerous eggs; these are the branches. This lay takes place parthenogen- 

 etically. These numerous eggs, which I call bud-eggs, in distinction from 

 the fecundated egg, give birth to myriads of aphids which are indifferently 

 aerial or subterranean ; these are the leaf-buds or the root-buds. . . . Sum- 

 mer arrives and then, quite like a plant which is about to flower, we see 

 develop amid the colonies of the Phylloxera some insects larger than 

 others, having stumps of wings ; these are the nymphs, these are the 

 tlower-buds and fruit-buds. These nj'mphs issue from the eartii ; their 

 skin splits, and a winged insect appears; this is the Hower. This winged 

 insect is neither male nor female, but, (juite like a flower, carries within 

 itself little envelops of different sizes, which it will lay on the leaves or 

 bark of the vegetals tliat are to nourisii its progeny. In the large envelo g 



