Vol 1.] Van Duzee .—Siinoptical Keys to Genera of Miriclae. 205 



KEYS TO THE GENERA 

 Tribe Mirini Douglas and Scott 



Head exserted, distinctly narrowed behind the eyes, which are not con- 

 tiguous to the anterior angles of pronotum; pronotum with a dis- 

 tinct collar 1 



Head not obviously exserted, eyes contiguous to the anterior angles of 

 pronotum, or nearly so 2 



1. Head strongly exserted, eyes being located at about the middle; 



median sulcus of the vertex short but distinct 1. CoUaria Prov. 



— Head little exserted, eyes being located near to the hind margin of the 



head but distinctly separated from the anterior angles of pronotum; 

 vertex transversely depressed between the eyes, median sulcus 

 nearly or quite obsolete 2. Miris Fabr. 



2. Base of pronotum truncated or a little emarginate at the middle 3 



— Base of pronotum concavely arcuated, leaving the base of scutellum 



broadly exposed 5 



3. Basal lobe of scutellum covered by pronotum 3. Stenodema Lap. 



— Basal lobe of scutellum exposed 4 



4. Body narrow, elongated; head one-third longer than broad, nearly or 



quite as long as the pronotum 4. Megaloceraea Fieb. 



— Body more ovate; head short, not longer than broad, much sliorter than 



the pronotum 5. Mesoniiris Rent. 



5. Large areole of the membrane entirely hyaline; head long and pointed, 



with the median sulcus deep 6. Trigonotylus Fieb. 



— Large areole of the membrane, or at least its outer half, opaque punc- 



tate; head short, transversely flattened at base, median sulcus 

 obsolete, or nearly so 7. Teratocoris Fieb. 



Tribe Horistini n.n. 



Head short, vertical, when viewed from tlie side nearly square at apex, 

 gula almost obliterated; elytra parallel, or the costa regularly and 

 feebly arcuated; second joint of hind tarsi not more than half the 

 length of the first 1 



Head a little oblique, when viewed from the side distinctly produced and 

 narrowed toward the apex, gula quite long, oblique; elytra con- 

 siderably expanded beyond the middle; second joint of hind tarsi 



nearly or quite as long as the first 2. Opisthuria Rent. 



1. Vertex and front more or less convex, front not at all tumidly pro- 

 jecting before the clypeus; sides of pronotum anteriorly carinate 

 only across the incisure separating the collum....l. Platytylellus Rent. 



— Front tumid, projecting prominently before the base of the clyjieus; 



pronotal margins anteriorly carinate to behind the callosities 



3. Oncerometopus Reut. 



Tribe Capsini Reuter 



KEY TO THE DIVISIONS 

 Body linear, constricted at the middle; pronotum swollen at its middle 

 and as wide there, or wider, than on hind margin....!. Myrmecoraria 



