514? LOCAL DISTRIBUTION OF INSECTS. 



drachna, Eyla'is and Limnochares are purely aquatic. 

 Several spiders will walk over the water ; and one species 

 (Argyroneta aquatica) inhabits it a . The stagnant waters 

 in your vicinity will produce different species from run- 

 ning ones. Thus Haliplus elevatus, &c. inhabits only the 

 latter, while the majority of the Dytiscida abound most 

 in the former : the more minute ones may be sought for 

 with success amongst the duckweed that covers a pool. 

 I do not recollect finding any insect in waters absolutely 

 salt b ; but brackish waters produce peculiar species : in 

 these only, Hydrcena marina occurs ; and many of those 

 large-eyed Cimicidae (Acanthia), as A. saltatoria, littoralis, 

 and Zosterte occur in places where salt water has been. 

 Latreille observes, that the genus Pimelia is to be met 

 with only where the soil is impregnated with saline par- 

 ticles, or where the species of the genus Salsola abound c . 

 Heaths, though they do not afford numerous insects, 

 have their rarities. Cicindela sylvatica, Carabus nitens 

 and arvensis, frequent them, and are not elsewhere to be 

 seen. Curculio nebulosus is also to be found on them, in 

 places where the turf has been peeled ; and some scarce 

 Lepidoptera. In their vicinity, in sunny sandy banks, 

 some of the rarer Ammophilce and Pompilimay be taken; 

 and it is here only that I have ever met with Panurgus d . 

 Meadows and pastures are not to be neglected. Early 

 in the year, when they are yellow with the blossoms of 

 Ranunculus bulbosus, Leontodon Taraxacum, &c., many 



a See VOL. I. p. 470. 



b A species of Gyrinus (G. Viola aquatica), described by Modeer 

 (Linn. Syst. Nat. Ed. Gmel. i. 161.2. n. 9.), is said to inhabit salt 

 water. 



c Geograph. &c. 6. d Apis*, a. Mon. Ap. AngL ii. 1/8. 



