42 Ins, 
IN SEC I'A. 
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639. Osborn, H. Silver-top in grass and the insects which may produce 
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640. . The Pediculi and Mallophaga affecting man and the lower 
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641. . Origin and development of the parasitic habit in Mallophaga 
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642. Osten-Sacken, R. Suggestions towards a better grouping of cer- 
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643. Packard, A. S. Notes on some points in the external structure 
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Relates chiefly to legs, eversible glands, and armature, but includes a 
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645. Parfitt, E. Devon Gollembola and Thysanura. Rep. Devon. Ass. 
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646. Perez, J. Diagnose d’un Hymenoptere du Gran Chaco. Mem. Soc. 
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647. Perkins, R. C. L. Male and worker characters combined in the 
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648. Petersen, W. Zur Frageder Ohromophotographie bei Schmetter- 
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649. Petri, K. Ueber den Stand der Coleopterenfauna der Umgebung 
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650. Pic, M. Tableau des Clytus (s.-g. Clytanthus ) voisins du Massili' 
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651. . Notes CoUopte.rologigu.es . Feuill. Nat. xxi, pp. 237 & 238. 
652. -. Description d’un Longicorne nouveau. Bull. Soc. Ent. Fr. 
1891, p. lxxvii. [Coleoptera.] 
653. -. Description d’un nouveau Longicorne. T. c. pp. cxxxiv & 
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654. . Descriptions de trois Long iconics d’Asie mineure. T. c. 
pp. clxxxv-clxxxvii. [ Coleoptera .] 
