chamberlin: chilopods from Mexico and west indies. 535 



Delobius spinifer, 



sp. nov. 



Dorsum brown, somewhat dusky; some plates with a paler median 

 longitudinal stripe. Head eoncolorous with dorsum. Antennae 

 dusky brown, at very tips paler, yellowish. Prosternum and pre- 

 hensors brown of a somewhat lighter cast; prehensors rufous distally. 

 Legs brown, the tarsi, of the posterior pairs in particular, brighter, 

 yellowish. 



Body slender, only very gradually narrowed cephalad to the third 

 plate which is of same width as the first. Head wider than any of the 

 plates. Width of head and of first, third, eighth, tenth, and twelfth 

 plates to each other as 56 : 47 : 47 : 54 : 54 : 47. Head wider than 

 long in ratio 14:13; widest at marginal breaks. Lateral marginal 

 breaks small but distinct, much closer to eyes than to caudal corners. 

 Strongly narrowed in front of eyes, the margin between which and 

 antennae is somewhat concave; margin near mesal side of antennae 

 on each side more strongly chitinous. The anterior median sulcus 

 sharply impressed, not attaining the suture caudad. 



Antennae of medium length. Articles 45-46 in type. Ai'ticles dis- 

 tad of the third short and very short. Ultimate article much longer 

 than the two preceding ones taken together. 



Ocelli 1 + 3, 3, 2; 1 + 3, 4, 2. Ocelli in type pale and indistinct. 

 Single ocellus well separated, largest, but the first one of the upper 

 series is nearly as large and is much larger than the others of series of 

 which those in bottom row are especially small, smaller than the 

 organ of Tomosvary in outline. 



Prosternum 1.84 times wider than long. Distance between chiti- 

 nous spots 1.84 times width at level of bottom of sinus; 2.2 times the 

 dental line. Teeth 3 + 3, small, the most ectal on each side more 

 remote from the median one than the latter is from the most mesal; 

 line of apices on each side slightly convex, otnitting the median tooth 

 on each side the line of apices would be straight. Sinus very wide 

 and very shallow, the distance between the teeth at its ends being 

 much greater than between adjoining teeth on each side. Spine small 

 and bristle like, inserted just ectad of ectal tooth. Margin slanting 

 back directly from spine. 



First dorsal plate in type 1.51 times wider than long; sides only 

 gently converging caudad, nearly straight cephalad of the rounded 

 caudal corners. Posterior angles of the ninth, eleventh, and thir- 

 teenth dorsal plates produced, the processes moderate. 



Porigerous areas of coxae moderately depressed. Pores circular: 

 3, 3, 3, 3 or with a small additional pore at proximal end on some of 

 the coxae. 



Spines of first and second legs, olfoToTT' ^^ ^^® third, q'^^q'^^'^ ; of the 



