Vol. XXVl] ENTOMOLOGICAL NEWS. 469 



EXPLANATION OF PLATE XX. 



Fig. 3A. Anaxipha scia new species. Miami, Fla. Male (allotype). 

 Dorsal outline. (X4). 



Fig. 3B. Anaxipha scia new species. Miami, Fla. Female (TYPE). 

 outline. (X4). 



Fig. 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. Anaxipha imitator (Saussure). Miami, Fla. Male. Dorsal 

 outline. (X4). 



Fig. 4B. Anaxipha imitator (Saussure). Miami, Fla. Female. Dor- 

 sal outline. (X4). 



Fig. 4C. The same. Lateral outline of caudal limb, internal. (Great- 

 ly enlarged.) 



Fig. 40. The same. Lateral 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 

 (Pelopoeus) caementarium and Chalybion cocrulciun 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 prepupal stage, and while their life cycle is 

 long, from September or even August, until June, they pass 

 through the same development as the summer brood. There 

 is no apparent difference 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 give forth their adults the next year in May or June. 

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

 critical period : 



