MORGAN HEBARD 159 



curved distad; dorsal surface of dorsal valves weakly nodose proximad, 

 the lateral margins acute, the external subcrenulate but very feebly and 

 bluntly toothed proximad. 



Measurements. — The extremes are: length of body $ (before extrusion 

 of penis) 17.5 and 18., $ 21.7 to 26.2; length of pronotum $ 4.3 and 4.7, 

 $ 4.8 to 5.2; caudal width of pronotal disk $ 2.6 and 2.7, $ 3.7 to 3.9; 

 length of tegmen $ 3. and 3.8, $ 4.2 to 4.8; length of caudal femur $ 

 9.7 and 10.2, $ 115 to 12. mm. 



Coloration. — Generally dark brown, the paler brown recessive specimens 

 with color pattern weaker. A broad dark postocular bar extends to the 

 principal sulcus of the pronotal lateral lobes and is continued, though 

 weaker, to the caudal margin in all but the palest specimens. Face, ven- 

 tral portion of pronotal lateral lobes, cephalic and median limbs brownish 

 buff; ventral surface buff, but male subgenital plate dark brown except 

 meso-proximad. Dorsum different shades of brown, with that portion of 

 abdomen buffy in males. Caudal femora with brown markings very weak 

 and suffused, the ventro-external and ventro-internal portions bright salmon 

 orange varying to tinged with scarlet, the intervening ventral and the 

 inner surfaces yellowish. Caudal tibiae glaucous (but buffy in one female) 

 suffused with brown laterad. 



From knowledge of the allied species and races I believe it 

 probable that additional series of this race will also show varia- 

 tion in the furcula, supra-anal plate and possibly the cerci of the 

 males. It is this individual and environmental variation coupled 

 with the close general similarity of the species and the abundance 

 of races which makes the Indigens Group one of the most diffi- 

 cult. This is aggravated by the fact that material is yet to be 

 secured in many large areas where the Group is unquestionably 

 present. 



A male and four female paratypes bear the same data as the 

 type. This series was found on the slope of a dry ravine among 

 rank grasses and low plants. In the vicinity were a few clumps 

 of Douglas Fir and choke-cherry. 



PART XIII. THE MANCUS GROUP OF THE GENUS 

 MELANOPLUS 



The species of this group are of unusual interest. All closely 

 resemble each other in general appearance and structure. The 

 male cerci afford much the most valuable features of external 

 difference, but the characters of the penis are found to be much 

 more important in determining the species and their proper rela- 



TRANS. AMER. ENT. SOC., LXIH. 



