is the typical gargamcllc S . Of 20 9 2 we have examined, only 3 

 could be called typical, these being of a distinct red-brown shade; in 

 the remainder the ground color is that of medusa with more or less 

 distinct banding, tending to become obsolete and produce typical 

 medusa. If necessary to retain this name at all gargamcllc ab. 9 

 medusa may be used in referring to the dark black-brown form with 

 obsolete markings. 



Such a color variation as is seen in gargamcllc is not uncommon 

 among the Lasiocampidac; a typical instance is seen in the European 

 pini which varies in the S sex in an exactly similar manner to garga- 

 mcllc; in the 9 sex the markings are so variable that scarcely any 

 two specimens are exactly alike. 



The full grown larva has been described by Coquillett, but so far 

 as we know there has been no account of the earlier stages. Our 

 correspondent writes us that contrary to the usual rule, the $ $ come 

 to light about 3 a. m. ; we presume the 9 is taken earlier in the 

 evening. 



Habitat : — Arizona. South California. 



GENUS TACHYPTERA n. gen. (Type psidii Salle) 



Eyes moderate, very sparsely haired ; palpi small, porrect, extending to 

 front, but forming no conical projection; antennae strongly bipectinate in S I 

 pectinations in 9 shorter; epiphysis in both sexes greatly reduced. Venation 

 much as in Glovcria, the stalk of veins R= and R3 of primaries usually much 

 longer; secondaries with well-developed intercostal cell, rather smaller than in 

 Gloveria ; M. and M3 with short stalk, occasionally almost connate. Sexes 

 similar. 



The genus bears about the same relation to Glovcria that Macro- 

 thylacia does to Lasiocampa. The similarity of the sexes, combined 

 with the larger, very sparsely haired eyes should justify the separation 

 in our opinion. 



Tachyi'tera r.siDii Salle. (Plate III, figs, i and 2.) 

 Boinbyx psidii Salle, Ann. Soc. Ent. Fr. (2) V, 16, PI. I, f. 2 (1857). 

 Lasiocampa psidii Walker, Cat. Lep. Het., XXXII, 560 (1865). 

 Macrothylacia psidii Kirby, Cat. Lep. Het. I, 834 (1892). 

 Metanastria psidii Druce, Biol. Cent. Am. Het. I, 201 (1887). 

 Gloveria psidii Dyar, Bull. U. S. Nat. Mus. 52, 261 (1902). 



