AJVIBRICAN COLEOJ'TERA. 31 



Eyos small: light organs feeble; ventral segments without stigma-like pores 2. 



Eyes large, but larger in % than 9 > light organs well develf)pefl ; % with strongly 



marked stigma-like ventral pores .3. 



2. — Antennce with second, joint one-half as long as third or nearlv so ?,. 



Antenna' very much compressed, not .serrate, second joint very slioj-t. trans- 

 verse ...LUCIDOTA. 



:!. — AntenntB not serrate, narrow, conipressed 4. 



Antenna' strmigly serrate ( 'J, 9 )» l"'"^'i'^'i"'^ snbcarinate, dorsal abdoniinal seg- 

 ments strongly lobed, % last dorsal broadly emarginate TENASPIS ii. ir. 



4.— Last dorsal segment % rounded ELLYCHNIA. 



bast dorsal segment % bisiuuate and truncate PYROPYGA. 



5.— I'rothorax snbcarinate ; J with lateral light organs PYRACTOMENA. 



Prothorax not carinate, frequently channeled : 9 '^^'ifb medial light organs. 



PHOTINUS. 



. liUC'IDOT.V Laii. i^/c/mwri's Motsch. 

 This geiui!'! is easily known by the veryjjroadh- oonipressed autemuu, 

 whicli are not serrate, gradually iiarruwed externally, and Avith the second 

 joint very shurt and transverse. The light (jrgaus are very feebly 

 developed, and indicated by yellow spots on the last ventral ( 9 )• o^" 

 last two ventrals (S ). The dorsal segments are acutely lobed at the 

 sides in both sexes, with the lobes directed backwai'ds. In the S the 

 last dorsal is truucato-eniarginate anil the seventh ventral is Ineniargiuate; 

 the middle lobe l)eing (piite distinct. 



To this genus belongs the Mexican L. thoracica (Oliv.). in which 

 the prothorax is yellow, the sent el testaceous, and the ventral segments 

 entirely l)lack. . 



These insects are diurnal and are tre(|uently seen flying in shady 

 I)laces ; when seized they exude from the joints of the legs and the sides 

 of the l)ody a milky fluid with a tlisagreeable odor. 

 Large, black, sides and apical margin of prothorax fulvous: %, 9- Length 1 — 



11 mm. X Y..: Ga.; Ill atra Fabr. 



a. — Prothorax black, with very narrow yellow margin; tarda Lee. 

 Small, narrow, prothorax pale, dorsal .spot and basal margin black, disc with two 



rosy spots; % last four ventral segments gradually testaceous. Length 



6 mm. Middle and Southern States punctata Lee. 



a. — Hind angles of jn-othorax blackish. 



EL,I.\XHNIA Lee. 



The antennte are narrow, usually not serrate, but always strongly 

 compressed, with the second joint but little wider than long, and abtnit 

 one-half as hjug as the third, which is not longer than the fourth. 

 The dorsal segments are not acutely lobed at the sides, and except the 

 penultimate are not produced l)ackwards. The last dorsal is truncato- 

 emarginate in both sexes ; and the light organs are wanting. In the % 

 the seventh ventral is broadly but angularly emarginate, and the eighth 



