1896.] spiDEHS feom; the lowbk amazons. 765 



B. Caropnco testaceous brown, margined with a broad 

 blind of dull orange silky pubescence. 



1. Size larger, 18 mm. long ($).— Central ante- 



rior eyes sliglitly smaller tlian laterals. Ante- 

 rior rowsligbtly procurved ; (posterior margin 

 of laterals aligned with centre of medians). 

 Laterals distinctly separate, subequal, antoriors 

 a little larger. Abdomen witJi central, longi- 

 tudinal, silver-white rufous lanceolate band, 

 broad in front, narrowed behind, on apical 

 three-quarters, with four, or sometimes five, 

 short oblique branching lines /, siemensi, n. sp. 



2. Size smaller, 10 mm. (2)- — Central anterior 



eyes a little larger tlian laterals. 

 Laterals scarcely separate; anteriors larger 

 than posteriors. Abdomen with central longi- 

 tudinal band of silver-white-rafous marks 

 (" Titta "), not reaching anterior margin, broad 

 in front, narrowed behind, with four short 

 branches on either side (" quadripennata ") ... /. pzisilla (B. Sim.). 



Rbmaeks. — The characters of /. cUr/itata, I. caudata, and I. 

 siemensi are taken from the type specimens. Those of J. guyan- 

 ensis from females from St. Vincent, identilied by M. Simon ; e 

 coll. Brit. Mus. Nat. Hist. Those of /. zehrina and /. pusilla are 

 taken from M. Simon's descriptions of the two species. As to the 

 first four there can be no doubt about their distinctness as species ; 

 1 am not so convinced, however, as to the distinction between 

 /. zehrina and /. guyanensis. M. Simon thinks that probably 

 1. zehrina and /. digitata are identical. 



The chief distinction drawn by M. Simon between the first two 

 is based on the difference between the anterior eyes : " lineam 

 suhrectam formaniibus " in zehrina ; in guganensis " lineain leviter 

 procurvam." I must confess that I am unable myself to appreciate 

 the distinction between " a line almost straight " and " a line slightly 

 curved." The other character, however, given in /. zehrina, " oculis 

 lateralihus suho'quis et utrinque juxta contigiiis," as contrasted with 

 " oculis lateralihus d.istincte separatis et antico postico niajore " in 

 /. guyanensis, may be a good one, provided it is drawn from a long 

 series of adult examples. The oblique bars in I. guyanensis are six 

 in number, the first 3 not united on the median line ; of I. zehrina 

 M. Simon says, " abdomen atrum in parte secunda lineis testaceis 

 ohliquis et ahhreviatis hiseriatis, utrinque tribus, ornatum." 



If I. zehrina (11 mm. long) and /. digitata (18 mm. long) are 

 identical, the characters of the former have possibly been taken 

 from an immature female. I. pusilla, too, must be closely allied to 

 I. siemensi, though the great difference in the size furnishes a 

 strong presumption that they are distinct. 



EXPLANATION OF TUE PLATES. 



Plate XXXIII. 

 Fig. 1. Mdodeus saiiguineus, n. sp., 2 (p- 758). Dorsal aspect. 

 2. „ niger, n. sp., § (p- 759). Dorsal aspect. 



