SPHENAE1UM. 205 



3. Sphenarium bolivari, sp. n. 



? Sphenarium hisirio, Boliv. Monogr. Pirgomorfinos, p. 98, figg. 14, 14 a (1884) \ 



Similar in size and general form to S. mexicanum, but lacking the tuberculations on the sides of the head 

 behind the eyes. In its coloration the present species, in the male at least, is much more varied than 

 is that sex of S. mexicanum ; but the striking difference is the conspicuous yellow medio-dorsal line 

 which extends without interruption from the front edge of the pronotum to the base or even middle of 

 the supra-anal plate. The general colour of the pronotum is fusco-olivaceous, save for the pale lower 

 edges, the dorsal line, and two or three short wedges of yellow on the back edge of dorsum between the 

 humeral angle and median carina. The mesonotum is red, as are also the lateral abdominal bands and 

 a dash just above the tegmina on the metathoracic ring. A tinge of the same colour is also found on 

 the sides of the pronotum just over the piceous line which borders the pale yellow lateral borders. The 

 basal abdominal segment above is provided internally with a rather prominent quadrate patch of yellow. 

 The pleura and venter, along with the face, are also pale yellow. The knees of the hind femora and the 

 base of the intermediate tibiae are infuscated, while the tibiae are greenish and without a trace of red 

 or coral. 



Length of body, S , 26-28 ; of pronotum 6-5, of hind femora 14-5 millim. 



Hab. Mexico l , Salina Cruz, Oaxaca (C. C. Beam, coll. L. Bruner). 



The female of this form is not definitely known. The two males found by Mr. Deam 

 are a little more robust and have a heavier median carina of the pronotum and the 

 fastigium of the vertex shorter and broader than in S. mexicanum. A male and female 

 are at hand from Cuernavaca, which appear to be intermediate between S. bolivari and 

 8. mexicanum. Bolivar's description of S. histrio is probably based on specimens of 

 the present form. 



4. Sphenarium mexicanum, Sauss. 



Sphenarium mexicanum, Sauss. Rev. et Mag. de Zool. (2) xi. p. 390 (1859) l ; Boliv. Monogr. 



Pirgomorfinos, pp. 98, 99 (1884) 2 . 

 ? Sphenarium ictericum, Gerst. Stett. ent. Zeit. 1873, p. 196 3 . 



Hab. Mexico 1-3 ,. Orizaba (//. H. Smith & F. B. Godman; coll. Bruner), Cordova, 

 Medellin, &c. (coll. L. Bruner), Tehuantepec (coll. Scudder 3 ). 



This appears to be the commonest and most widely distributed species of the genus. 

 It ranges from the sea-level to nearly or quite 4000 feet above, but is confined to the 

 humid portions lying to the eastward and southward of the great volcano of Orizaba. 

 Its size is quite variable, as is also its coloration. 



5. Sphenarium marginatum, sp. n. 



This species is comparable with S. mexicanum, from which it differs, as shown in the synoptic table, by its 

 more slender form and the pale-edged pronotum in the female. It differs further in being generally much 

 duller coloured, in lacking the red or purple dorsal and abdominal bands of S. mexicanum, and in its 

 somewhat longer fastigium of the vertex. 



Length of body, <$ 22, $ 26 ; of pronotum 55 ; of hind femora, <J 13-5, $ 12-5 millim. 



Hab. Mexico, Cordova {Edge: 6 $ ), Orizaba, Medellin (coll. L. Bruner: 6 $ ). 



