April, '16] DAVIS: WHITE GRUB INVESTIGATIONS 267 



of the anal segment bears rather thickly placed hooked spines, inter- 

 mixed with a few long hairs. The dorsal surface of the anal segment is 

 smooth in the middle, the sides and tip with a mixture of long and 

 short, moderately erect hairs. 



The grubs of Ligyrus gibhosus agree closely with those of Cyclo- 

 cephala but the reticulation of the head is slightly more roughened, 

 and the hairs or spines on the ventral surface of the anal segment are 

 remarkably short, they are not hooked, and are more closely placed. 



Ligyrus relidus is a more robust grub, the posterior abdominal seg- 

 ments being much enlarged and giving the grub a characteristic appear- 

 ance. The head is small, dark brown and its surface reticulate. The 

 ventral surface of the anal segment bears a patch of sparsely and 

 irregularly placed short spines intermixed with a few longer hairs, and 

 the dorsal surface of this segment bears only a few short spines and 

 hairs. 



The grubs of Osmoderma eremicola have a moderately light brown 

 head and the mandibles and head at the base of mandibles are jet 

 black. The ventral surface of the anal segment is covered with heavy 

 spines, intermixed at the sides and extremities with longer hairs. The 

 upper surface of this segment bears moderately short, uniformly placed, 

 recumbent hairs. 



Stratagus antceus grubs are at once distinguished from other grubs 

 mentioned above by the dark reddish brown head which is uniformly 

 punctured with rather deep pits. The under surface of the last abdom- 

 inal segment bears many spines which are slightly inclined caudad, 

 the border of the patch of spines intermixed with longer hairs and the 

 upper surface of same segment with moderately sparsely placed re- 

 cumbent hairs. 



Trichius piger grubs are small and have a pale brown head with an 

 inconspicuous reticulation. The dorsal and ventral surfaces of the 

 anal segment bear an irregular scattering of short spines and rather 

 long hairs. 



Dyscinetus trachypygus has a dark brown head which is incon- 

 spicuously reticulate and covered with irregularly placed fine punc- 

 tures, in this respect differing from all species mentioned above, except- 

 ing Stratccgiis, the head of which is much more coarsely punctate and 

 the species is much larger. The ventral surface of the anal segment 

 bears a patch of hooked spines and the upper surface of the same seg- 

 ment is covered, excepting along the longitudinal median line, with 

 fine hairs, those at the tip being shorter, stouter and more spine-like. 



Field Observations 



The distribution of the many species is being worked out as rapidly 

 as the collections being received will permit. We have records of 



