6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 72 



7V/?e.— Cat. No. 40437, U.S.N.M. 



Two females reared in January, 1925, by Alan P. Dodd under liis 

 No. 105. 



Genus TRICHOCRYPTUS Thomson 



Sodas' FoEESTEE, Verb. Nat. Ver. Preuss.. RheinL, vol. 25, 1868, p. 187 — 



ScHMiEDEivNECHT, Eiit. Naclir., vol. 16, 1890, p. 113. Type. — Ichneumon 



cinctorius Fabricius. 

 Trichocryptus Thojison, Opusc. Ent., fasc. 5, 1873, pp. 520, 521 ; vol. 6, 



1874, p. 609. Type. — Ichneumon cinctorius Fabricius. 

 Apsilops AsHMHAD, Traus. Amer. Eut. Soc, vol. 23, 1896, p. 207 (not 



Foerster). Type. — Cryptus hirtifrons Ashmead. 

 Dapamis Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 29 (not Foerster). 



Type. — Ichneumon chictorius Fabricius. 



In an earlier paper ^ I argued that Ichneumon cinctorius Fabri- 

 cius could not function as the genotype of Sohas Foerster on the 

 ground that it would not agree with the characters ascribed by 

 Foerster to his Family Cryptoidae, in which he placed the genus 

 Sohas. Upon examination of Foerster's manuscript, however, I find 

 that he actually founded his genus on cinctoHus ; and it must, I 

 therefore think, be accepted as the type of Sohm in spite of its 

 disagreement with the generic description. 



Sohas Foerster is preoccupied by Sohas Pascoe, 1863. 



As pointed out by Thomson (p. 612), the genotype will run in 

 Foerster's key to the Phygadeuontoidae to either Apsilops or Hetero- 

 typus^ depending upon whether the basal flagellar joints are con- 

 sidered short or long as stated in couplet 7 of the key. It will 

 certainly not run to Dapanus^ in which genus Ashmead placed it and 

 of which it was considered as type by Viereck, for by the same char- 

 acter by which it agrees with Heterotypus it differs from Dapanus. 



All published notes on the biology of species of Trichocryptus 

 associate it with water. As earlj?^ as 1785 Fourcroy * records {Ichneu- 

 mon scirpi Yo\Jivcvoy)= Trichocryptus cinctoHus (Fabricius) as liv- 

 ing in its larval stage in Scirpus^ while Henriksen ^ records the other 

 European species, Trichocryptus aquaticus Thomson as parasitic on 

 Hydroca/mpa nympheata feeding on Potamnogeton natans. Hart ^ 

 records having observed {Gryptus cyanieiventris Riley MB) = Tri- 

 chocryptus hirtifrons (Ashmead) walking on the leaves of water 

 plants both above and below the surface of the water in search for 

 its host {Hydrocampa) Nymphula ohliterdlis (Walker). The dense 

 fine pubescence of the body is apparently associated with the habit 

 of entering water. 



sProc. U. S. Nat. Mus., vol. .58, 1920, p. 258. 



^ Entomolo.§ia Parisiensis, pt. 1, p. 413. 



BEnt. Meddel., vol. 12, Heft 2, 1918, p. 218. 



6 Bull. 111. State Lab. Nat. Hist., vol. 4, 1895, pp. 178 and 270. 



