Vol. XXVi] ENTOMOLOGICAL NEWS. 469 



EXPLAMATION OF PlATE XX. 



PIf. jA. Anaxipka scia new species. Miami. Fla. Male (allotype). 

 Dorsal outline. (X4). 



Fif. 3B. Anaxipka scia new species. Miami, Fla. Female (type). 

 otrtline. (X4). 



Fif. 3C. The same. Lateral outline of caudal limb, internal. (Great- 

 ly enlarged.) 



Fig. 3D. The same. Lateral outline of ovipositor. (Greatly en- 

 larged.) 



Fig. 4A. Anaxipka imitator (Saussnre). Miami. Fla. Male. Dorsal 

 outline. (X4). 



Fig. 4U. Anaxipka imitator (Saussure). Miami. Fla. Female. Dor- 

 sal outline. (X4). 



Fig. 4C. The same. latrrat outline of caudal limb, intemaL (Great- 

 ly enlarged.) 



Fif. 4D. The samr i.dtcrai outline of ovipositor. (Greatly en- 

 larged.) 



The Number of Generations per Year of the 

 Mud-Daubers (Hymen.)* 

 By Phil Rau, St. Louis, Mo. 



The two species of the mud-daubing wasps, Sceliphron 

 {Pehpoeus) cacmcntarium and Chalybion coeruleum certainly 

 have two generations a year and perhaps three. 



If we gather the nests during the winter, the young under 

 natural conditions, never emerge before May or June. They 

 hibernate in the prepapal stage, and while their life cycle is 

 long, from September or even .\ugust, until June, they pass 

 through the same development as the summer brood. There 

 is no apparent diflference between the adults that have gone 

 through the long and the short periods of development. We 

 have never found any of these insects hibernating as adults, 

 nor have we ever seen an adult after the first of (October. 



August is usually the dividing line of the year. Nests taken 

 in the early part of August give forth their adults in the same 

 or in the following month ; those taken in the latter part of 

 the month ^nvc forth their adults the next year in May or June. 

 The table below is compiled from notes on nests taken at this 

 critical period: 



