228 FIRST ANNUAL REPORT OF THE STATE ENTOlfOLOGIST. 



Cook : iu Second Ann. Kept. Mich. St. Pomolog. Soc. for 1872, (1873), p. 667 (in- 

 jury to grapes and history); in Thirteenth Ann. Rept. St. Bd. Agr, Mich, 

 for 1874, (1875), p. 145. f. 41 (remedies). 

 Crotch : Check List Coleop. Amer., 1873. p. 59, no. 3445. 

 LeB-VRON : Fourth Ann. Kept. Ins. 111., 1874, p. 87 (mention). 

 Horn : in Trans. Amer. Entomolog. Soc, v, 1876, p. 184 (sexual differences). 

 Thomas : Sixth Rept. Ins. 111. [1877], p. 103 (habits, remedies, description) ; 



Seventh Rept. Ins. 111., 1878, p. 34 (description). 

 LiNTNER: in Count. Gent., Ixv, 1880, p. 407 (description, habits, transforma- 

 tions, etc.). 

 The appearance of this beetle, in any considerable number, is a suf- 

 ficient cause of serious alarm to the gardener and fruit-grower. It 

 often makes its advent suddenly, in immense numbers: it is exceed- 

 ingly voracious, has an extensive range of food-plants, is very difficult 

 to destroy, and is distributed over a large portion of the United States, 

 occurring, according to Dr. Horn, especially in the Northern States, 

 northward of a line from Virginia to Colorado. It has been known 

 for more than a hundred years, during which time it has often forced 

 itself upon public attention by its depredations upon fruits, field-crops, 



flowers, etc. 



Classificatory and Descriptive. 

 The species, according to our present classification, belongs to the 

 extensive group of Lamellicornes, or lamellicorn beetles, as they are 

 commonly called, from their antennas terminating in a club consisting 

 of from three to seven thin, flat, movable plates or leaves, as shown 

 in Fig. G8, which can be unfolded and closed like a fan, at the 

 pleasure of the insect. It is a member of the family of ScaraimidcB, 

 and of the sub-family of MclolonthidcB. The genus Macrodadylus sig- 

 nifies long-footed, referring to the long joints of the tarsus as shown be- 

 low. It comprises only American species, of which but three are known. 

 The common May -beetle, Lachnosterna fusca, is an allied species, be- 

 longing to the same family. Unlike that beetle, however, the rose- 

 beetle, represented in Figure G8, is compara- 

 tively slender and small. Its body is about 

 one-third of an inch long. " It tapers be- 

 lore and behind, and is entirely covered with 

 very short and close ashen-yellow down ; 

 the thorax is long and narrow, angularly 

 widened in the middle of each side, which 

 suggested the name suhspinosns, or some- 

 FiG. 68.— The Rose-bug, Macro- -what spined ; the legs are slender and of a 



DACTTLUS SUBSPINOSUS, sliglltly J 4.1 • • 1. „P 4.U« f^^i- nr-c, 



enlarged- enlarged attenna on the pale red color, and the pints of the teet are 

 right; enlarged front leg on the ^.^^^^ ^.^^ ^^^^^^ and are very long."* Dr. 



=!=For several interesting features in which the sexes differ, see Dr. Horn's Note, m 

 Trans. Amer. Ent. Soc, v, 1876, pp. 183-185. 



