220 ENTOMOLOGICAL NEWS. [May, ’o08 
shelter of the dense red cedar and juniper growth as far as 
that went, and then crossed to the lee shore, and dropping 
down to near the water’s edge, proceeded along in the cover 
of the sand dune until the first breath of the wind was en- 
countered when they gradually rose in the air and started over 
the lake on the usual course. The exactitude with which 
they followed each other was remarkable. One could stand 
between two red cedars where they crossed to the shore and 
ninety per cent. of all butterflies would pass within striking 
distance of a net. Sometimes a lull would come in their pro- 
cession and the last would be out of sight in the distance 
before the next appeared but when it came it would appear 
beating over the same clump of juniper and within a few 
yards of the exact spot in which the previous ones first 
hove into sight. 
Whether these were all migrating in the true sense of the 
word or not I leave to the entomologists to decide. I can just 
record the facts as I saw them in the hopes that they may be 
of some interest to others of more experience in the ways of 
the Lepidoptera. One more fact may be worthy of mention. 
All specimens of plexippus seen were in good shape, with un- 
worn wings while most of cresphontes and troilus were more 
or less worn, especially the latter, few of which had not lost 
part or all of their tails and were otherwise damaged though 
not enough to seriously impair their flight. 
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Some Larrid Wasps from Colorado. 
By S. A. Rouwer, Boulder, Colo. 
I wish to express my thanks to Prof. T. D. A. Cockerell, 
for going over my manuscript. 
The types of the species here described are in my own col- 
lection. 
Tachysphex nigrescens n. sp. 
9. Length 6 mm, Anterior margin of clypeus rounded out, with- 
out distinct lateral teeth, shining, sparsely covered with punctures; 
front dullish, densely and rather coarsely punctured; vertex shining, 
the punctures not as dense as those on the front; space between the 
