572 



IXSECTA. 



more or less hidden from view. The rostrum is short. They 

 feed on animal juices. 



Fam. Notonectidae (Rlickenschwimmer). Corixa striata L., Notoiiccta glauca 

 L., water-bu.L'. 



Fam. Nepidae, water-scorpions (fig. 475). Naucoris cimicoidcs L., Xcpa 

 clncrca L., water-scorpion. Ilanatra linear is L. 



Tribe 2. Geocores (Land-bugs). Antennae directed forwards, and 

 of medium length, having four or five joints. The rostrum is usually 

 long. 



Fam. Hydrometridas (Plotcrcs) (Wasserlaufer). Ifydromctra lacustris L., 

 Limnobatfx stagnoritm L., Velio, riculonim Latr. 



Fam. Reduvidae (Pcdnvini) (Schreitwanzen). Meduvius pcrsonatus L., 

 Pirates stridiilvs Fabr., South Europe. 



Fam. Acanthiadae (Membranacei), skin-bugs. Acanthia, lectularia L., bed- 

 bug. Aradus deprcssus Fabr. (corticalis L.). 



Fam. Capsidae (Blindwanzen), Cap&us trifasciat us L., 

 Mi ris erratic-its L. 



Fam. Lygaeidae (Lygaodes) (Langwanzen). Lygaus 

 equestris L., Pi/rrhocoris apterus L. (Feuerwanze). 



Fam. Coreidas (Corcndcs) (Randwanzeu). Coreus 

 marginatus L., Alydiis calcaratus L. 



Fam. Pentatomidae (Schildvvanzen). Pentatomajuni- 

 pera L., P. rujipes L., P. oleracea. 



Order 6. Diptera * (Antliata). 



Insects with piercing and sucking mouth parts, 

 with membranous front wings. The hind wings 

 reduced to small knobs (halteres}. The metamor- 

 phosis is complete. 



The designation of this order, which is de- 

 rived from the apparent number of the wings, 

 does not correspond accurately to the actual 

 Two pairs of wings are present, the front pair 

 always as large glassy and transparent plates, the hind pair in a 

 rudimentary condition as stalked knobs (halteres). On the inner 

 margin of the front wings two lobes are marked off by indentations ; 

 an ou'.er lobe (alula), and an inner one (squama) which may cover 



* J. W. Mcicfen, " Systematische Beschrcibung der bckanntcn europiiischen, 

 /weifiiigeligen Insecten," 7 Theile. Aachen, 1818-1838. 



Wiedemann, " Aussereuropiiische zweiflugelige Insecten," 2 Theile. Hamm. 

 1828-1830. 



N. Wagner, " Ueber die viviparcn Gallmiickenlarven," Ze'itschr. fiir. wiss. 

 Zool., Tom. XV., 1865. 



A. Weissrnann, " Die Entwickelung der Diptcren," Lcipsig. 1SG4. 



A. Weissmann. " Die Metamorphose der Corcthra plumicornis," 1806. 



Pro. 475. JWpo cinrrnt 

 (r^gne animal). 



state of matters. 



