THE CANADIAN ENTOMOLOGIST. 379 



founded the genus Myodocha in 1807 with a fair description and 

 named three species; tipidoides (a Leptocorisa) , trispinosa (a Cyda- 

 mus), and fulvipes (an Ischnodemiis), but as his generic diagnosis 

 in no way fits any one of these species, it becomes evident that 

 his manuscript must have been mixed and the genus becomes 

 invalid here. In 1810 he corrects this error and names serripes 

 as type of Myodocha, but as this species was then undescribed, 

 the genus is still invalid, but becomes of force the following year, 

 when Oliver describes it as Myodochus and gives a recognizable 

 description of serripes. Leach, in 1815, names tipidoides as type 

 of Myodocha, and is followed in this by Burmeister and Kirkaldy, 

 but this is obviously invalid. The name Leptocorisa first appears 

 as Lepiocorise in 1825 (Latreille, Fam. Nat. Reg. Anim., p. 421) 

 as a nomen nudum and not in a Latin form. In 1827 Berthold, 

 in his German translation of Latreille's work, changes the French 

 form to Leptocorixa, but does not describe the genus nor mention a 

 species, so it is still a nomen nudum. In the 1829 edition of 

 Cuvier's Regnum Animalia Latreille first characterizes the genus 

 making it equivalent to Gerris Fabr. (of the Syst. Rhyng.), except 

 vagabundus, but does not state that it is a substitute for that name 

 so it need not have the same type. Laporte in 1832 names his 

 linearis ( = filiformis Fabr.) as type, which, being an original 

 species, is valid and must stand. 



Genus Corizus Fall. — Brulle, 1835, first fixes the type of 

 Corizus as hyoscyami Linn., and Westwood in 1840 fixes that of 

 Rhopalus Schill. as capitatus Wolff (= subrujus Gmel.). The 

 former is equivalent to Therapha Am. & Serv. and the latter is 

 the Rhopalus of Stal and the Corizus of the Oshanin Katalog. 

 As subgenera, neither are found in our fauna. 



Genus Leptocoris Hahn. — On account of the close resemblance 

 of this name to Leptocorisa Latr. it has been renamed three times, 

 and in each case the name was given as a straight substitute for 

 the supposedly preoccupied Leptocorisa, and must take the same 

 type. These names are Serinetha Spin., Lygceomorphus Blanch., 

 and Pyrrhotes Westw. Leptocoris is valid and must stand for this 

 genus, and the tribe becomes Leptocorini, not Serithini. Kirkaldy, 

 in Proc. Hawaiian Ent. Soc, vol. II, p. 123, 1910, has established 

 a new subgenus of Leptocoris as Boisea. He founds it in but few 



