126 COLOMBIAN DERMAPTERA AND ORTHOPTERA 



Dorsal surface shining, black tinged with chestnut brown, this strongest 

 proximad on abdomen. Pronotum with lateral wings almost entirely cinna- 

 mon-buff, the punctae and cingulate margin bay, before the mesal point is a 

 triangular invasion of the black mesal portion, which dark portion is also 

 extended to the caudal margin above the humeral trunk of the tegmina. 

 Tegmina black tinged with chestnut brown; marginal field, which includes the 

 apex, cinnamon-buff, the punctae bay. Head black with a feeble chestnut 

 tinge, antennae prout's brown except in proximal portion which is buffy, 

 ocelli, genae, palpi and mouthparts ochraceous-buff. Limbs and coxae pale 

 ochraceous-tawny, the spines slightly darker, coxae suffused proximad on 

 cephalic faces with blackish. Meso-proximal portion of abdomen ochraceous- 

 tawny, becoming black tinged with chestnut laterad and very extensively 

 distad. 



The type is unique. 



ACROPOROBLATTA « new genus 



The three genera of Perisphaerids here described are all evi- 

 dently boring types, the females for the most part probably 

 living in and boring through decaying vegetal^le matter. 



The peculiar longitudinal gland-like swelling of the lateral wings 

 of the pronotum in the present genus, is a feature not found in 

 any other American genus of the Blattidae. The pronotal con- 

 tour shows a more specialized development of the type found in 

 the female sex of Porohlatta^^ 



Genotype. — Acroporohlatta adenophora new species. 



Description of Genus. — Form elongate with entire dorsal sur- 

 face strongly convex. Interocular space extremely broad, ocelli 

 small but apparent. Pronotum heavily punctulate, with surface 

 strongly convex, the cephalic portion conspicuously separated 

 from the larger caudal portion by a broad transverse sulcation, 

 strongly defined only meso-laterad ; lateral wings with a well-de- 

 veloped, longitudinal, gland-like swelling, lying parallel to the free 

 margin from a point adjacent to the eye to near the caudal mar- 

 gin, the resultant convexity there of the pronotal surface about 

 equally decided on its external and internal surfaces. Tegmina 

 and wings absent. Distal portion of abdomen, limbs and their 

 armament, pulvilli and arolia as given here in the generic de- 

 scription of Colapteroblatta. 



■** From a/cpoTTopos = boring through. 



^^ It is probable that in these species the males will be found to show similar 

 but less decided pronotal modification than the females. 



