198 Mr. R. MacLachlan's Monograph of 



2. Chrysopa vittata, Wesmael. 



Chrysopa vittata, Wesm. Bull. Acad. Brux. 1840, p. 

 211; Hag. Ent. Ann. 1858, p. 21, Stett. Zeit. 1858, p. 

 131, 1859, p. 412. Eemerohius alMts, Fab. Syst. Ent. 

 309 (not of Linne); Chrysopa alba, Burm. Handb. ii. 918; 

 Brauer, Haid.Abh. 1850, p. 6. G. perla, (Leach), Steph. 

 ni. vi. 105 (not of Linne); Evans, Tr. Ent. Soc. v. 78, 

 pi. is. fig. 4. jH". proxintus, Ramb. Nevrop. 425 (1842). 

 C. Integra, Hag. Stett. Zeit. 1852, p. 40. 



Very similar to G. flava, but instantly separated by the 

 somewhat rounded costal margin of the anterior wings ; 

 the basal joint of the antennce is longer ; the maxillary 

 palpi marked with fuscous, especially the terminal joint; 

 the prothorax has a small blackish mark at the margin of 

 the anterior angles ; the wings are broader, the neuration 

 of all the wings wholly pale, excepting about four or five 

 cubital veinlets near the base, which are black. 



After death, the abdomen has a strong tendency to 

 turn blackish. 



Length of body 6-7 lines; expanse of wings 19-22 lines. 



Appears in summer; according to my experience not 

 so common as G. flava. 



This and the preceding species are almost constantly 

 mixed in collections. 



3. Cheysopa alba, Linne. 



Eemerohius albus, Linn. Faun. Suec. 382 (1761), Syst. 

 Nat. i. 911; Ghrysopa alba, Steph. 111. vi. 104; Evans, 

 Tr. Ent. Soc. v. 78, pi. ix. fig. 1; Schn. Mon. Chrys. 77, 

 pi. xiii; Brauer, Neurop. Aust. 60; Hag. Stett. Zeit. 

 1852, p. 40, Ent. Ann. 1858, p. 22. G. cUiata, Wesm. 

 Bull. Acad. Brux. 1840, p. 212. 



Very pale whitish green. 



Head small, immacu.late. Vertex raised, with a depres- 

 sion in the middle in front. Antennce and palpi conco- 

 lorous with the head, not marked. 



Prothorax immaculate ; the anterior angles rounded ; a 

 transverse raised line rather behind the middle, and the 

 posterior margin also raised. 



Abdomen slightly pubescent. 



Legs very pale ; tmgues brown, very strongly curved, 

 the basal portion much dilated internally. 



