chamberlin: chilopods from Mexico and west indies. 505 



TiTANOPHILUS FRATRELLUS, Sp. IIOV. 



Dorsum anteriorly and at very caudal end of body ocliraceous; in 

 the middle of a distinctly olivaceous cast. The color of venter nearly 

 the same as that of the dorsum. Head and prosternum with prehen- 

 sors pale brown of a dilute olivaceous cast. Antennae and legs yellow. 

 Body robust; narrowed at very caudal end and less obviously in 

 anterior region. 



Head subcordate; widest caudally and conspicuously narrowed 

 cephalad, as a whole somewhat convex, the caudal border apparently 

 sharply depressed, the elevated edge arcuate. Only a little wider 

 than long (37:34). A short, deep median longitudinal sulcus on 

 middle portion of plate. Cephalic plate not wholly covering pre- 

 hensors from above. 



Basal plate very wide and very short; wider than the head; 6.5 

 times wider than its median length. 



Antennae flattened as usual; very short; broad at base and uni- 

 formly narrowing distad. Ultimate article short, pointed, a very 

 little shorter than the two preceding articles taken together. 



Claws of prehensors slender; when closed not attaining front 

 margin of head. 



Exposed portion of prosternum a little more than twice wider than 

 the greatest length; five times longer than the greatest length of 

 femuroid. Margin between prehensors wide, weakly concave; a 

 vague, dark nodular elevation each side of middle. 



First dorsal plate wider than the basal plate and also than the 

 second tergite. Not quite twice as long as the basal plate (ratio 11:6); 

 shorter than the second in ratio 11 :13; sides much converging caudad. 

 Dorsal plates strongly bisulcate, with a much weaker or often obsolete 

 median sulcus between the paired sulci; sulci becoming weaker or 

 obscure on most anterior and most posterior plates. Anal tergite 

 caudally semicircularly rounded or mesally somewhat obtusely angu- 

 lar; equal in length and breadth. 



Prescuta in caudal region short but distinct, becoming very short 

 cephalad. Prescutum of last pediferous segment longest at -middle, 

 running out to a point on each side, its caudal margin appearing 

 convex and its anterior one straight. 



Ventral plates not specially marked. Last ventral plate broad 

 but relatively much longer than in T. maximus, being only twice as 

 wide as long; sides straight, strongly converging; caudal margin 

 weakly incurved from end to end. 



Ventral pores small, not very dense, occurring over all of sternite 

 excepting the usual median area. 



Spiracles narrowly oblong, placed a little obliquely to the longi- 



