1098 FAMILY LIII. CiiniouMr.j.il).]',. 



e. Front of bead uoiinal, not iiiflexed, mouth anterior. 

 /. Last dorsal segment of abdomen not exposed ; middle ventral seg- 

 ments not narrowed. 

 (1. Antemi83 widely separated at base, usually more so than the 

 length of first joint. 

 h. Front coxse rounded; third tarsal joint bilobed. 



Tribe VII. Eumolpini, p. li;!l, 

 lih. Front coxje transverse; third tarsal joint usually entire. 



Tribe YIII. Ohrysomelini, p. 114'.). 

 <i!). Antennas rather close together at base, inserted on the front; 

 front coxie conical and prominent. 

 ). Hind thighs slender, adapted for vralking. 



Tribe IX. Galekucini, p. IWi. 

 a. Hind thighs thickened, adapted for leaping. 



Tribe X, Halticixi, p. 1177. 

 ff. Last dorsal segment of abdomen exposed and sloping downward ; 

 form of body robust, compact, subcylindrical. 

 j. Surface of body coarsely tuberculate above ; antennas received 

 in marginal grooves on the lower side of thorax. 



Tribe V. Chlamydixi, p. 1114. 

 jj. Surface of body not tuberculate; antennae not received in 

 grooves. 

 k. Prostei'num not separating front coxiE ; antennie short and 

 serrate. Tribe IV. ('LVTIIEI^'I, p. 1112. 



l:k. Presternum extending between front coxse; antennie usually 

 long and slender. Tribe \h Ckyitocepiiauxi. p. llKi. 

 «;. Front of head inflexed, mouth inferior ; form oblong, wedge-shaped, 

 broad and truncate behind ; surface usually strongly pitted or 

 reticulated. Ti'ibe XI. IIispi.mi. p. TJ-'.".. 



(Id. Thorax and elytra with broad, expanded margins; head (iu our spe- 

 cies) concealed; outline of body elliptical or nearly circular. 



Tribe XII. Cassiih-N'i, p. I'J'JS. 



Tribe I. DONAOIINI. 



Oblong, graceful beetles? of inedinm size which occur upon the 

 leaves and stems of water-lilies, arro^^-head, pond-weed, skunk cab- 

 bage, pickerel Aveed, reeds, sedges and other water-loving plants, 

 and hence are semiaquatic in habit. In form and general appear- 

 ance they resemble certain Cerambvcida? and constitute a eonnert- 

 ing link between that family and the present. The larva' Hac on 

 the outside of the submerged roots of the plants above mentioned, 

 and obtain their supply of air through the tissues of the plant. 

 When about to change into pupa^ they enclose themselves in silken 

 cocoons, a niunber of «hich are often found fastened in a row to the 

 stems or roots of the aquatic plants. The mature beetles are more 

 or less gregarious, and fly about on bright sunny days, alighting on 

 the leaves or flowers in numbers. 



