24 BLUTISH TYUOGLYPHID^E. 



and some slightish details of the external anatomy ; it 

 is sufficiently illustrated by outline drawings. It gives 

 a rather full description of what is said to be the hypo- 

 pial nymph, which the author correctly treats as 

 unknown up to that time. Unfortunately the paper is 

 seriously injured by the author's almost complete 

 neglect of the previous literature on the subject, and 

 by great confusion in nomenclature and identification ; 

 he appears to have relied solely upon Eiley's very 

 slight notice,* and to have adopted without question a 

 name and identification which Eiley himself expressed 

 great doubt about, and which is entirely incorrect. 



The creature described by Ligniere is not a Tyro- 

 glyphus at all, it is a Histiog 'aster. Moreover it is not 

 the Acarus mains of Shinier, nor anything like it ; it is 

 the well-known Histiogaster entomophagus of Laboul- 

 bene. The real Acarus mains of Shimer is a totally 

 different creature, which, oddly enough, Ligniere de- 

 scribes as new in a paper t immediately following the 

 paper now being spoken of, and calls Hemisarcoptes 

 coccisug'iis. Lignieres' paper must be considered as one 

 upon Histiogaster entomophagiis, adding some biological 

 facts and a description of the hypopial nymph to the 

 already somewhat full description of the species in the 

 paper by Laboulbene and Robin above referred to. 

 Ligniere is right in saying that his is the first descrip- 

 tion of the hypopial nymph of the species, but he omits 

 all reference to the previous descriptions and drawings 

 of the almost undistinguishable hypopial nymph of the 

 allied species Histiogaster corticalis by Prof. Canestrini 

 and myself; he apparently has overlooked these 

 memoirs. The whole question of the identification 

 and correct naming of these species will be found 

 fully dealt with in this book under the head of Histio- 

 gaster entomophagus in vol. ii. 



* ' Fifth Annual Report on Noxious, etc., Insects of Missouri ' (1873)* 

 p. 87. 



f " Etude zoologique et anatomique de V Hemisar copies coccisugus," 

 in ' Mein. Soc. zool. France/ t. vi (1893), pp. 1625. 



