THYCE AND POLYPHYLLA 353 



usual, much less slender. Length 19.5 mm.; width 9.0 mm. One 

 specimen. 



Florida (locality not recorded) gracilis Horn 



The descriptions of cavifrons, subvittata and crinita of LeConte, 

 are drawn from the original diagnoses in each case (Journ. Acad. 

 Phila., 2nd series, vol. 3, pp. 229-230). The name crinita is now 

 generally applied to the smaller species, with small antennal club, 

 from the more southern parts of California and named incolumis 

 above, while only the larger and more northern forms, with large 

 antennal club like that of lo-lineata, were intended by the author 

 to bear that name. Doubtless a number of species were confused 

 with both crinita and lo-lineata by LeConte and Horn, and the 

 only safe coarse, because of possible subsequent accidental shifting 

 of type labels, is to go to the original descriptions. In the case of 

 lo-lineata, I have chosen a form agreeing exactly with Say's de- 

 scription in form, color, ornamentation and size of the body. In 

 that of hammondi Lee., the identification from the Kansas speci- 

 mens admits of no doubt and the above description is therefore 

 taken from that series. 



The forms of the lo-lineata section are numerous and very con- 

 fusing, owing to mutual similarities of organization, combined in 

 certain cases with a peculiar inconstancy in the form of the scattered 

 squamules, as noted under that species; in oregona these incon- 

 sistencies may be sexual to some extent. Some large and conspicu- 

 ous species of this section, such as potosiana and matrona seem to 

 be well differentiated by the tibiae of the females; these inhabit the 

 more southern Sonoran faunal regions. After separating these 

 and two rather distinct and probably local species, pacifica and 

 squamotecta, of the California fauna, there remain a considerable 

 number of less accentuated forms, which are usually mingled to- 

 gether under the name lo-lineata Say; but after reasonably close 

 and attentive study, these forms can readily be seen to fall into 

 two distinct groups, one inhabiting the Rocky Mountain system, 

 extending to the northwest into Washington State, having the 

 body smaller and the clypeus narrower and more truncate, and the 

 other confined to the true Pacific coast fauna, much larger in the 

 body and with broader and less evenly truncate clypeus. There 

 can be scarcely any doubt that these groups represent two distinct 



T. L. Casey, Mem. Col. V, Nov. 1914. 



