]312 FAMIIA' LXI. — MOKDELLID.Ti;. 



d. Deep hlm-k. finely iiubeseent; Itase of thorax broadly rouiuled at 



middle. 242H. mel.i:na. 



dd. Dull black, pubescence brownish: base of thorax nuicli less 

 rounded. 2424. scutellaris. 



^A.'. Elytra with distinct yellow or ash-^ray spots or markings. 



e. Elytra each with four spots of yellowish pubescence, the one at 



base broadly curved. 2425. octopunctata. 



ee. Elytra with stripes or with more than four spots. 



/. Anteiuitx^ and front legs black ; thorax marked with ash-gray 

 pubescence and large black spots. 

 //. Elytra with small silver gray spots, usually more or less 

 confluent. 2426. marginata. 



(j(j. Elytra with a narrow sutural line and an oblique stripe from 

 humerus toward the middle, ash-gray. 2427. lunulata. 

 //. Antennre and front legs dull yellow ; thorax and elytra speckled 

 with small, unetjual yellowish spots ; elytra with an inter- 

 rupted band behind middle and the tips also yellowish pubes- 

 cent. 2428. SERVAL. 

 00. Last joint of m;ixillary iialpi either broadly hatchet-shaped or with 

 the sides equal. 

 /(. Head and thorax black. 



/. Thorax sparsely clothed with yellowish pubescence, more densely 

 at base ; elytra with a broad basal band, enclosing on each a 

 round black spot, and an interrupted band behind the middle 

 yellowish or ash-gray. 2429. oculata, 



//. Thorax marked with ash-gray pubescence and large black spots. 

 j. Elytra with a broad basal band, including on each side two 

 spots, and two oblicpie undulated bands of yellowish or ash- 

 gray puljescence. 2430. triloba. 

 ./■/'. Elytra with a broad basal band, including each side a very 

 large black s])ot. a band just behind middle and the tips ash- 

 gray. UNDULATA. 

 /;/(. Head and thorax partly yellow; elytra with crossbands of black 

 and yellow. 2431. discoidea. 



M. bonaJis Lee, length 3-4 mm., is snid to occur in the "North- 

 ern States," and has been recorded from Cincinnati, 



2423 (7779). Mobdella mel.ena Germ., Insect Si». 

 Nov., 1824, 1G9. 



Deep velvety black; pubescence at base of ely- 

 Ira :nid on sides of under surface often more or 

 less iridescent; base of pygidium usually silvery 

 inibescent. Length 5-7 nun. (Fig. 574.) 



Throughout tlie State; frequent. June 9- 

 August 1. Occurs especially on blossoms of 



Fig .i74. (After Smith ) f -i i 



Wild rose. 



