16 Trails. Aca^. of St. Louis 



Their thin walls would certainly ofTer little protection 

 from the elements. The live mentioned a])ove all fell 

 ^vhen 1 tried ever so irently to move the twij? to photo- 

 graph them. This cluster also suir^^ests that one mother 

 may ho capahle of liuildinLC that number, althouirh of 

 course we have not absolute i)roof that they are the work 

 of one parent. These facts, as well as the fact that those 

 Avasjjs have been seen late in the autumn, lead mo to 

 suspect that those wasps hibernate as adults. 



Monobia quadridois. This wasp was brinirini^ in cater- 

 j)illars at intervals of thirty minutes, at G a. ni. on dune 

 "28. Five days later the nest was examined; the cater- 

 pillars were still alive, althouirh much shrunken. They 

 were very dissimilar, and represented probably two 

 species of the Gelechidae. This wasp uses the old gal- 

 leries of carpenter bees and one such nest witli mud par- 

 titions is shown in PI. Vll, fi^ 10; all three younjj: were 

 parasitized by cuckoo bees. The first of these to emerge 

 was the lowermost one, the first viXii; deposited. This 

 made a hole in its cocoon and a neat hole in the mud phi,*,' 

 above, entered the cell above, crept past its younj^or 

 brother and bit a neat round hole in the second ])lug also. 

 It was in the antechamber when I discovered and re- 

 moved it. 



Ancistrocenis near tigris Sauss. [S. A. Roliwor]. This 

 was seen to enter and leave an old beetle burrow in a 

 fence-post. The hole contained no nest; the purpose of 

 the visit w^as not ascertained. In earlier studies we have 

 learned that this species inhal)its the old nests of niud- 

 daubors, Sceliphron cacmcutariinn. Five of these wasps 

 emer^'-ed from sumac stems taken in St. Louis, between 

 April -A and 7, H)19. 



Stenoch/nrnis qumhisccfus Say. [ S. A. Rohwor]. This 

 was captured on tlie window of a loi,^ chicken-house, Sep- 

 tember r_\ 11)17. 



Sloiodifurnis zcndaloidcs Kobt. fS. A. Kohwer]. This 

 wasp hatched early in May, 1!)1S from a sumac twig 



