species of Longiconx Beetles. 275 



Hammoderus albiplagiatus^ n. s. 



n. elytris apice subacutis (nou spinosis) ; thoracis dorso, lateribus 

 singulis, vittula nivea poiie spiuam, et puncto parvo ; elytris ciuereo- 

 fuscis, punctatis, ad basin subtuberculatis, singulis macula nivea 

 basali ; plaga laterali irregulari ante mediam partem, plaga altera 

 nivea post mediam, et macula nivea ante apicem, punctulisque 

 paucis niveis, prsesertim ad marginem posticam ; mesothoracis 

 latere albo unimaculato ; abdominis segmento primo lateribus uni- 

 maculato. 



Of a cinereous brown ; the back of the thorax with three small 

 transverse tubercles ; on each side behind the spine there is a 

 short snow-white vitta, and a white dot behind the middle tu- 

 bercle; the elytra are punctured, and at the base are shghtly 

 tubercled ; they are without punctures on the white spots ; the 

 base of each elytron has a largish snow-white spot, neither touch- 

 ing the scutellum nor the shoulder ; before the middle and near 

 the lateral margin is a large white mark, the edge of which is 

 somewhat lobed ; behind the middle, and with the sides about 

 equally distant from the margin and the suture, is another 

 irregular white mark, and before the apex there is a smaller one ; 

 there are a few small white dots, especially on the hind part of 

 the margin of the elytra ; when any of the spots are dotted, 

 around the dot there are no hairs ; the under side of the mcso- 

 thorax has a white spot, and there is also a small white spot on 

 each side of the basal segment of the abdomen ; the front tibiae 

 are somewhat sinuated on the inside. 



Length 9j lines. 



Hab. Mexico. (Coll. Brit. Mus.) 



Hammoderus thoracicus, n. s. 



II. fuliginoso-fuscus ; vertice sulcato lineis duabus albis antice con- 

 vergentibus ; thoracis dorso scabriusculo lineis tribus albis, mediana 

 subobsoleta, alteris supra spinas laterales, margines anticas nee 

 posticas tangentibus ; elytris ad basin subtuberculatis, apice singulis 

 unispinosis ; maculis variis irregularibus niveis, abdominis lateri- 

 bus albido submaculatis. 



Of a fuliginous brown ; the crown of the head grooved, and 

 with a whitish line on each side of the groove, the two Hues 

 converging in front ; the back of the thorax somewhat scabrous, 

 with three longitudinal snow-white lines, the middle one nearly 

 obsolete, the side ones thicker, one above each latei'al spine, 

 neither reaching to the front nor the hind margin ; elytra with 

 the shoulder and the base somewhat tubercled, the tip of each 

 spined ; there are some scattered, snow-white, irregular marks, 

 three of them larger than the rest ; one of these is before the 

 middle, the second is behind the middle, and the third is before 



