INSECTA DIPTERA. 193 



With respect to the propagation of the Aphides, there is still much obscu- 

 rity to be unravelled, and which is reserved for careful anatomical and physio- 

 logical research. The attention of observing Entomologists will, without 

 doubt also, be the more directed by this work, to the investigation of the 

 remarkable natural history of this family, since, by accurate descriptions 

 of all the species known to the author, the determination of the Aphides 

 is now rendered easy. His arrangement is as follows : I. Winged 

 Aphides, Leaf-lice, Aphidina. A. Anterior wiugs, with bifurcate cubitus. 

 (1) Aphis, L., Antennae 7-jointed, usually as long or longer than the body ; 

 119 species. (2) Lachtms, 111., Ant. 6-jointed, not longer than the head 

 and thorax ; 13 sp. B. Anterior wings, with a simply forked cubitus : 

 (3) Sclnzoneura, Hart.; Anteu. 6-jointed, wings fastigiated, posterior 

 wiugs with two oblique nervures ; 6 sp. (4) Faciuia v. Heyd., Anten. 5 

 jointed, wings horizontal, posterior wings with one oblique nervure ; 2 sp. 

 C. Anterior wiugs, with simple cubitus. (a] Ant. 6-jointcd, anterior wings 

 with four oblique uervures : (5) Pemphigus, Hart., posterior wings, with two 

 oblique nervures ; 7 sp. (6) Tetrcnmira, Hart., posterior wings, with one 

 oblique nervure ; ] sp. (b) Anterior wings with three oblique nervures : (7) 

 Chennes, L., Anten. 5-jointed, wings fastigiated ; 4 sp. : (8) Phylloxera, 

 Eousc., Anten. 3-jointed, wings horizontal ; 1 sp. II. Apterous Aphides, 

 Earth-lice, Hyporneneutes. (a) Antennas 6-joiuted : (9) RhizoJmis, Burin, 

 (the name cannot be retained, as it has previously been applied to a Coleop- 

 terous genus), terminal anteunal joint, blunt, longer than the penultimate ; 

 2 sp. (10) Forda, v. Heyd. (Rhizoteres, Hart.), terminal antennal joint 

 pointed, much less than the penultimate ; 1 sp. (b) Antennas 7-jointed, 

 terminal joint very small. (11) Trama, v. Heyd., posterior tarsi elongated, 

 without joints ; 1 sp. (12) Paracletiis, v. Heyd., posterior tarsi 2-jointed ; 

 1 sp. 



The habits of the individual species are noted with exemplary accuracy. 

 With reference to the propagation, the author distinguishes (1) vivi-ovipara 

 (Aphis, Lachirus) ; (2) ovipara (Chermes, Phi/lloxena, Faeuna ? ) ; (3) vivipara 

 (Tetraneiira,Pemphigus, Schizoneura, and with great probability also the Earth- 

 lice: Forda, Rliizobins, Paracletm, Trama,} 



liatzeburg (Ent. Zeit. p. 201) has subdivided Chermes Abictis, L., into two 

 species, Ch. viridis, and coccineus. The latter coincides with Ch. strobilobius, 

 Kaltenb,, whilst the former is his Ch. Abietis. 



COCCIDES. Ratzeburg (1. c. p. 202) has given a notice of a new Coccus, 

 C. racemosus, the females of which congregate upon the small branches of 

 the fir, frequently as thickly as grapes in a bunch ; at first yellowish, 

 afterwards darker brown. The male much resembles that of Coccus Cacti, 



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