MORGAN HE BARD 203 



In atropos the difference in size of the sexes is much less apparent; 

 the pronotum axerages only slightly smaller in the male, the 

 length being contained in the width about 1.43 times in both sexes. 

 The interocular space in the male is slightly more than half, to 

 fully, the interocellar width; in the female slightly less than, to 

 fully, the interocellar width. The dark pronotal spot is normally 

 solid ; faint traces of a jjortion of the same type of marking as found 

 so conspicuous in craiiiifer are apparent in rare examples. The 

 tegmina are dark blackish brown with an argus brown tinge, the 

 marginal fields are brownish Inifty, often suffused with darker 

 distad ; the tegmina appear otherwise almost solid in coloration 

 until spread, when the humeral trunk is found to be very dark, the 

 anal field rather pale and the mesal portion of the tegmina rather 

 darker than the other distal portions. 



The female of B. varians of Serville is clearly this species; the 

 male the same as his B. discoidalis. 



In addition to the diagnostic features described above, the fol- 

 lowing features are found in the present species. 



(Key West, Florida.) Head blackish brown in general coloration, eyes often 

 paler, ocelli and soft portions of clypeus conspicuously buffy. Ocelli distinct; flat- 

 tened surfaces of ocellar areas slanting mesad, so that the inner margins are raised 

 slighth- above the flattened intervening portion of the face. Pronotum subellipti- 

 cal, the cephalic and caudal margins almost equally con\-ex, this slightly more pro- 

 nounced mesad on both margins, the latero-caudal angles faintly indicated b\" a 

 slightly greater convexity there of the caudal margin. Tegmina broad, broadly 

 rounded distad, with apex mesal in position. Wings with anterior field decidedly 

 suffused with brown, posterior field less suftused, all veins dark brown. Dorsal 

 surface of abdomen in both sexes with seventh segment acute-angulate produced 

 latero-caudad, with apices of productions blunt; eighth much narrower across 

 abdomen and but slightly projecting beyond caudal margin of seventh, with small, 

 rounded, latero-caudal projections; ninth still narrower across abdomen, with 

 caudal margin straight. Supra-anal plate projecting and subciuadrate, moderateK^ 

 bilobate. Cerci moderately slender, slightly incurved, tailoring distad to acute 

 apex, with about se\"enteen short joints; ])olished and slighth' con\ex abo\e, 

 strongh' con\ex and ^■ery hair>' lielow, with narrow, deep, lateral channels on exter- 

 nal and distal portion of internal margins. Mesad in the anal chamber of the male, 

 from above a soft surrounding mantle, a moderately stout, short, tapering, blunt^ 

 chitinous projection extends caudad; the surrounding mantle having the free dorsal 

 and distal margins fringed with minute, chitinous teeth. Dextrad of this organ, 

 from a broad chitinous base, a stout subchitinous shaft is directed caudad cur\ing 



MEM. .AM. E.\T. SOC, 2. 



