PARADISE KEY SAFFOED. 407 



pretty insect, somewhat like a yellowjacket, marked witli four trans- 

 verse yellow bands. 



C amysomeris quadrimaculcitus^ the largest wasp of the park (pi. 

 51, fig. 7), takes its name from four bright yellow spots on its abdo- 

 men. This insect makes no nest, but burrows in the earth in search 

 of grubs of beetles and other larva), in which it deposits its eggs. 

 Contrasting with it in size is a square-headed little solitary wasp, 

 Hypocrabo decemmaculatue (pi. 51, fig. 3), which stores its cells 

 with small insects. Smaller than this are Pristanlacus fforidanus 

 (pi. 51, fig. 5), belonging to the ensign flies (Evaniidae), and a cer- 

 tain unidentified Braconid belonging to the genus Heterospilus, many 

 individuals of which were found in the burrow of a borer. 



HORXETS AND MUD DAUBERS. 



A collection of Hymcnoptera received from Mr. C. A. Hosier in 

 March, 1918, included several hornets, mud daubers, and solitary 

 wasps, kindly determined for the writer by Mr. H. L. Viereck. 

 Among the hornets, or social wasps, were Folisfes niblgmosiis^ of a 

 reddish-brow^n color, which constructs unprotected nests resembling 

 honeycomb in sheltered places, and Polistes annularis^ somewhat 

 smaller and darker colored, which ranges as far north as New Jersey. 

 Among the mud daubers were Scelephron cementarius, a widely dis- 

 tributed species with very slender-pediceled abdomen, and legs va- 

 riegated with yellow; the dark, steel-blue Chalyhion coeruley/m; the 

 " thread waist " mud wasp, Sphex vulgaris^ with the upper part of 

 the abdomen adjoining the threadlike pedicel orange-colored; and 

 the little slender TrypoxyJon collhium., devoid of yellow bands on 

 the abdomen, many of whose close allies store their cells with small 

 spiders or insects. In addition to these there was a rare little soli- 

 tary wasp, Zethus {Didymog astro) pocyi^ with its abdomen sepa- 

 rated from the thorax by a fusiform or pear-shaped peduncle, and 

 with narrow wings directed backward but not overlapping. 



BEES AND THEIR ALLIES. 



Among the bees collected on Paradise Key the following have been 

 identified by Mr. Crawford : Bomhios pennsylv aniens, a widely spread 

 bumblebee (pi. 51, figs. 8, 9, 10) ; Xylocopa micans Fabr., a car- 

 penter bee, which excavates galleries in dry wood (pi. 51, fig. 1) ; 

 several leaf cutters, including the rare Mcgachile pollicaris Say 

 (pi. 51, fig. 4) ; a parasitic cuckoo bee (Coelioxys) ; and a metallic, 

 green jewel bee {Augoehlora) which digs burrows in the ground. 



Perhaps the most interesting of all these are the leaf cutters be- 

 longing to the genus Megachile (pi. 51, fig. 4). These are the in- 

 sects which cut circular disks from leaves wdth which to line their 



