308 REPORT ON ZOOLOGY, MDCCCXLIV. 



inside of the shards, close to the edge, against which the shagreened sides 

 of the abdomen play. 



6. Rednvius, according to Goureau's incorrect representation, produces its 

 tones by the friction of the neck against the fore rim of the fore-chest ; but 

 as the neck is smooth this explanation is not credible, any more than it is 

 agreeable to the reality. The fact is that the groove of the fore-breastplate 

 (prosteruum) is delicately fluted, and the end of the sucker playing in it at 

 an angle of 45 produces the sound. 



7. In Mutilla, Goureau has correctly accounted for the sound by the friction 

 of the hind rim of the second abdominal segment upon a dusky spot at the 

 base of the third ; but he is mistaken in describing this spot as smooth, 

 since it is finely wrinkled crosswise. 



8. The machinery of sound in Acheta, Locusta, and Grt/lhis has been 

 previously examined and described by various observers. 



9. Pneumora has ten to twelve raised horny ribs at the sides of the 

 bladder-like abdomen, and a finely serrated ridge along the inside of the 

 hind thighs, which is drawn across the former. 



Schiodte (ibid. 69) adds that in Lema Ininnca the moveable instrument 

 consists of two ridges on the last abdominal segment, which are delicately 

 scored across, not much raised, and a little inclined towards one another. 



Bohemann lias laid before the Stockholm Academy his 

 narrative of a journey to Lapland in 1843. (Oefvers. K. 

 Vetensk. Akad. Forhandl. i, 95 ; translated into German in 

 Hornschuch's Archiv. Skand. Beytr. i, pt. 2, p. 299.) 



This expedition has been one of great interest in respect to the Entomo- 

 logy of the northern regions. Nearly eleven thousand insects were collected, 

 and more than one hundred new species discovered. The expedition set 

 out from Stockholm the 24th of May, its destination Quickjock, au Alpine 

 district, where they arrived by the 27th of July. The Flora was splendid 

 and diversified. The insects diminished in number of species as they 

 ascended the mountains, so that about two hundred species of Coleoptera 

 only were collected during a six weeks' stay at Quickjock. Geotrupes 

 stercurarius, which is found throughout the low country, did not occur ; of 

 Carabi,glabratus&\o\ic. Orthoptera are not numerous, and Gryllus pedestris 

 (Locusta, Lch.) is the only species which extends to the summit of the 

 mountain. Of Hemiptera there are some conspicuous types, but the species 

 are few. Of Lepidoptera not many butterflies or larger rnoths, but, on the 

 other hand, the minuter tribes are more abundant in the high lands. Hy- 

 meuoptera in general rare, except Humble-bees and the parasitic tribes 

 (Pupivora). Diptera compose the great mass of iiise.pt life. If the species 

 become fewer, the multitude of individuals is proportionally enormous ; 



