106 MISCELLANEOUS PAPERS. 



and having a moderately or quite thick chorion. The first of these 

 species that we took up was Parasetlgena segregata Rond., which 

 issued from hibernating puparia along with Blephai'ipa scutellata. 

 For a time it was confused with the latter species, since only a dozen 

 or so specimens issued and these were not at first examined with a 

 lens. The radical difference in the behavior of the females soon at- 

 tracted our attention to their distinctness from scutellata. The fe- 

 males were not alarmed at the close proximity of large caterpillars 

 of Porthetria dispar.^ but, on the contrary, were highly excited to 

 oviposition by them, repeatedly and most enthusiastically and ener- 

 getically ovipositing upon them whenever the caterpillars were j^laced 

 near. This is apparently a single-brooded species. 



TACHINA AND ALLIES. 



Tricholyga grandis Zetterstedt, Tachina lav varum Linnaeus, and 

 Tachina utilis Townsend are closely related to each other and all 

 deposit very similar eggs, which are much like those of Parasetlgena 

 segregata.. but somewhat narrower and more elongate in shape and 

 with a thinner chorion. They are all deposited A^ery freely upon cat- 

 erpillars. The species of Tachina are at least double-brooded, and 

 the second generation of T. grandis has been recently reared by us to 

 the fly, showing it to be three-brooded. 



The Qgg of an undetermined European species, which I refer 

 doubtfully to Hemimasicera, is similar to these in all characters except 

 that it is of a decidedly light-yellow color. The eggs of this group of 

 species are normally deposited in a practically undeveloped stage of 

 the embryo. 



Two Japanese species of Tachina, representing in Japan the Euro- 

 pean T. laroarwm and T. utilis, but specifically distinct from them, 

 have the same character of eggs and belong in the group with 

 Parasetlgena segregata, just mentioned. ^^Hiat has been said of this 

 group applies to them. 



TACHINA CLISIOCAMP^ Townsend. 



An American s^Decies of Tacliina, which I identify as cUslocampm, 

 also deposits the same kind of eggs. It has been reared from both 

 Euproctls chryso7-'rha'a and Porthetria dispar. An interesting point 

 has recently been determined in connection with it. It oviposits very 

 freely on large caterpillars of dispar over the greater part of the 

 dispar-miefited area from Rhode Island to Maine. Last season great 

 numbers of its eggs were found on the dispar caterpillars, a great 

 many of which were brought into the laboratory for rearing. Not 

 a single tachinid puparium was secured from them. The fact that no 

 puparia could be reared from caterpillars covered with eggs seemed 

 inexplicable. The explanation was found this season, when many 



